Kurzgesagt Earth Timeline Puts All Human History in Final Second

Kurzgesagt – In a Nutshell

Microscopic organisms dominated Earth for more than three billion years, leaving recorded human history to unfold entirely within an imperceptible split-second of planetary time.

AI-assisted summary of 4.5 Billion Years in 1 Hour — original source. Check the original for full context.

Source published: 2023-11-10

Key ideas

Kurzgesagt maps Earth's entire 4.5-billion-year history into a calibrated one-hour video, where every single second represents roughly 1.5 million years of geological and biological change. (0:00)
Microscopic, single-celled life dominated Earth's biosphere for over 3.5 billion years, with complex multicellular organisms only expanding visibly in the final ten minutes of the timeline. (47:33)
The Great Oxidation Event roughly 2.5 billion years ago displaced atmospheric methane with cyanobacteria-produced oxygen, collapsing Earth's greenhouse effect and triggering prolonged planetary glaciation. (27:46)
The entire span of modern humans and recorded human civilization occupies merely the final split-second of the one-hour geological journey. (59:57)

Detailed notes

## Background Published by Kurzgesagt – In a Nutshell on YouTube on November 10, 2023, this video marks the channel's 10-year anniversary by scaling the 4.5-billion-year history of Earth into their first one-hour animated film. Accompanying their elaborately detailed Timeline of Evolution poster, the project frames planetary deep time as a continuous musical train ride where each second represents over a million years of geological and biological change.

## TL;DR The presentation charts Earth's chronological journey from its violent molten accretion, the collision that formed the Moon, and billions of years of single-celled prokaryotic survival in toxic, oxygen-deprived seas. It follows key evolutionary turning points, including the Great Oxidation Event, the emergence of eukaryotic cells, and the dramatic burst of complex multicellular life during the Ediacaran and Cambrian explosions. After sweeping through the reign and mass extinction of the dinosaurs, the timeline concludes with the rapid diversification of mammals, showing how all of recorded human history flashes past in merely the final fraction of a second.

## Atmosphere & style Set against an immersive, evolving soundtrack by Epic Mountain, the film creates a hypnotic, meditative experience that feels like watching eons glide past a train car window. Narrator Steve Taylor strikes a balance between existential awe and playful, dry wit, highlighting the absurdity of how agonizingly slow early life evolved compared to the frantic, catastrophic bursts of recent epochs. The overarching emotional arc is humbling and perspective-shifting, leaving the viewer stunned by the vast scale of planetary deep time and the utter novelty of human civilization.

## Bulletin - [00:00](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=0s) Kurzgesagt maps Earth's entire 4.5-billion-year history into a calibrated one-hour video, where every single second represents roughly 1.5 million years of geological and biological change. - [47:33](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2853s) Microscopic, single-celled life dominated Earth's biosphere for over 3.5 billion years, with complex multicellular organisms only expanding visibly in the final ten minutes of the timeline. - [27:46](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1666s) The Great Oxidation Event roughly 2.5 billion years ago displaced atmospheric methane with cyanobacteria-produced oxygen, collapsing Earth's greenhouse effect and triggering prolonged planetary glaciation. - [59:57](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3597s) The entire span of modern humans and recorded human civilization occupies merely the final split-second of the one-hour geological journey.

## Key takeaways - [00:00](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=0s) Compressing 4.5 billion years into one hour creates a temporal scale where 1 second equates to approximately 1.5 million years of planetary evolution. - [00:41](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=41s) The early Hadean Earth experienced a violent collision with Theia, generating a debris field that accreted into a massive Moon in close orbit. - [06:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=408s) Despite the infant Sun being 30% dimmer than today, extreme greenhouse gas concentrations kept early Earth's surface warm during the Late Heavy Bombardment. - [08:16](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=496s) Cellular life originated around 4 billion years ago during the Eoarchean, potentially cradled within deep-sea hydrothermal mineral vents. - [13:18](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=798s) Stromatolites provide the earliest robust macro-fossil evidence of microbial communities by the Paleoarchean, coinciding with the advent of solar photosynthesis. - [18:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1115s) Plate tectonics initiated modern continental craton formation during the Mesoarchean, despite oceans exceeding 40°C and an atmosphere lethal to modern life. - [27:46](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1666s) The Great Oxidation Event saturated natural chemical sinks, allowing free oxygen to wipe out atmospheric methane and trigger the Huronian Snowball Earth glaciations. - [33:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2028s) A critical mass of uranium-235 deposits in groundwater-rich sandstone in modern-day Gabon created a self-sustaining natural nuclear fission reactor around 1.8 billion years ago. - [39:37](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2377s) The symbiotic merger of two single-celled organisms during endosymbiosis produced the first eukaryotic cells containing defined nuclei and organelles. - [42:17](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2537s) Earth's solid inner core crystallized relatively late in planetary history (~1.4 billion years ago), shortly before red algae pioneered eukaryotic sexual reproduction. - [47:33](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2853s) The Tonian period introduced single-celled eukaryotic predators, driving defensive biomineralization and sparking the planet's first evolutionary arms race. - [51:14](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3074s) Following the Cryogenian Snowball Earth, the Ediacaran biota ushered in the sudden, widespread appearance of complex multicellular body plans. - [53:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3215s) The Cambrian explosion established the architectural body plans (phyla) for nearly all modern animal lineages while plants first established beachheads on land. - [55:01](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3301s) Incompletely decayed woody plant material from dense Carboniferous swamps was buried and compressed into Earth's major coal reserves. - [56:42](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3402s) The Permo-Triassic mass extinction wiped out over 90% of marine species due to massive flood basalt eruptions in the Siberian Traps, clearing ecological room for the rise of dinosaurs. - [58:02](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3482s) The 10-kilometer-wide Chicxulub asteroid impact terminated the Mesozoic Era 66 million years ago, paving the way for the rapid adaptive radiation of mammals. - [59:57](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3597s) All recorded human civilization and evolutionary history are condensed into an imperceptible fraction of the video's final second, illustrating the profound brevity of human existence.

## Detailed walkthrough ### [00:00](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=0s) The Scale of Deep Time

The vastness of Earth’s 4.5-billion-year existence lies entirely outside the realm of intuitive human comprehension. To bridge this cognitive chasm, the video frames planetary history as an immersive, continuous musical train ride where the outside view spans the entire chronological arc in a single hour. In this calibrated experiment, a single second of real time corresponds to approximately 1.5 million years of geological change, allowing viewers to passively observe the passing landscape, use it as a soundtrack for study or relaxation, or actively watch the incomprehensible stretch of a billion years unfold.

As Steve Taylor points out to set up the thought experiment, “Earth is 4.5 billion years old – impossible for your brain to truly grasp, so here is an experiment: every second around 1.5 million years will pass – you're on a musical train ride looking out the window, passing all of Earth's History in an hour.” The journey begins at the planet’s violent birth, when the nascent world existed merely as an incandescent hell of churned magma.

- Scaling factor: 1 second = roughly 1.5 million years. - Total video span: 4.5 billion years compressed into approximately 60 minutes.

[00:41](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=41s) The Hadean Eon and the Birth of the Moon

Very early in this molten beginning, Earth experienced a colossal impact with a Mars-sized celestial body named Theia. The titanic debris field generated by this collision quickly aggregated into the Moon, which originally loomed extraordinarily massive in the night sky. Across subsequent hundreds of millions of years, tidal dynamics pushed the Moon into a steadily receding orbit, gradually reducing its apparent size to the familiar disk seen today.

By 4.5 billion years ago, Earth was plunged into its inaugural geological eon, the Hadean, named aptly after the Greek ruler of the underworld. For tens of millions of years, the planetary surface remained dominated by an ocean of molten rock beneath an atmosphere choked primarily with carbon dioxide. Direct physical traces of this foundational epoch are almost entirely erased from modern geology because the churning crust was continually recycled. Even so, durable microscopic crystals called zircons survived, offering subtle geochemical signatures that tiny reservoirs of liquid water were already present amidst the fiery chaos. As Steve Taylor remarks about the sheer pacing of early Earth, “Settle in, this will take a while.”

```mermaid flowchart TD accTitle: The Hadean Origin Sequence accDescr: Flowchart showing early planetary formation steps from Theia impact to first waters. subgraph S1["Planetary Formation"] A["Proto-Earth"] -->|"Collides with Theia"| B["Debris Disk Accretion"] B --> C["Giant Moon Formed Close to Earth"] end subgraph S2["Hadean Conditions"] C --> D["Atmosphere Rich in CO2"] D --> E["Magma Oceans & Molten Surface"] E -->|"Trapped in Zircons"| F["Earliest Traces of Liquid Water"] end ```

[06:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=408s) Heavy Bombardment and Faint Young Sun

Several hundred million years into the solar system’s youth, the inner planets endured an unrelenting barrage known as the Late Heavy Bombardment, where countless asteroids relentlessly battered the cooling crust. Despite the violent celestial shelling, global temperatures remained paradoxically balmy. Although the young Sun radiated around 30% less luminosity than it does today, the thick blanket of atmospheric greenhouse gases trapped enough ambient heat to keep the surface extraordinarily warm.

As Steve Taylor playfully sums up the climate paradox of the infant planet, “At this point in time, our Sun is 30% less bright than it is today but there are so many greenhouse gases that it's still much hot and comfy.” Underneath this dense, heat-trapping sky, planetary cooling steadily accelerated, setting the stage for prolonged geological shifts.

- Solar luminosity: Approximately 30% lower than present-day output. - Atmospheric compensation: Hyper-dense concentrations of greenhouse gases preserved elevated surface temperatures. - Astrometric disturbance: Relentless impacts smashed the crust for several hundred million years.

[08:16](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=496s) Eoarchean: The Spark of Cellular Life

The narrative shifts toward the dawn of biology as the Eoarchean begins around 4 billion years ago. Only a few hundred million years following Earth’s initial accretion, the earliest cellular organisms quietly emerged and began dispersing across an otherwise lethal terrain. Prolonged torrential rains, enduring over millions of continuous years, cooled the rocky crust and pooled into the world's premier oceans, submerging the bulk of the planet.

Deep below the ocean surface, hydrothermal vents belched scalding, mineral-laden fluids into the sea, providing sheltered geochemical cauldrons rich in chemical energy. Speculating on this foundational genesis, Steve Taylor notes, “These hydrothermal vents we're looking at, and where hot minerals emerge, may have been the place where life first developed, but we dont know.” Despite the ambiguity surrounding the precise site of abiogenesis, single-celled organisms took hold across the oceanic expanse.

- Hydrological cycle: Relentless rainfall spanned millions of years to generate global oceans. - Environmental candidate: Deep-sea hydrothermal chimneys offered thermal and chemical gradients essential for primitive biochemical pathways.

[13:18](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=798s) Paleoarchean: Stromatolites and Sunlight

Transitioning into the Paleoarchean roughly 3.6 to 3.2 billion years ago, the planet’s physical cadence was remarkably different: because the infant Earth rotated far more rapidly, the length of an individual day was significantly shorter. While early supercontinental cratons were slowly coalescing deep beneath the water, the surface remained an unbroken watery world. Reaching this point marks an immense milestone for the viewer, with over one billion years of continuous history having elapsed.

Concrete physical fossils emerge during this chapter in the form of stromatolites—layered sedimentary mounds painstakingly built by colonies of single-celled microbes. At the same time, life achieved a revolutionary biochemical leap by tapping directly into solar radiation. Reflecting on this evolutionary milestone, Steve Taylor explains, “Also life is starting to eat the sun – photosynthesis might have started as early as around here.”

- Physical traces: Stromatolites provide humanity's earliest robust macro-fossil evidence of microbial communities. - Planetary dynamics: Faster axial rotation produced markedly shortened day-night cycles.

[18:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1115s) Mesoarchean: The Era of Continents

Around 3.2 billion years ago, the Mesoarchean commenced, initiating the true era of continental construction. The crust had differentiated enough for modern-style plate tectonics to engage, driving rigid slabs into violent collisions, buckling rock upward, and plunging subterranean slabs deep into the mantle to melt and recycle. These subduction and collision zones laid down the fundamental continental crust that endures today.

Global oceans during this period mirrored hot tubs, bubbling at temperatures exceeding 40°C while microbial populations multiplied across all available ecological niches. The atmosphere was profoundly devoid of molecular oxygen and remained inundated with untamed greenhouse gases, creating conditions that would instantly kill modern humans. Emphasizing the lethal ambient climate, Steve Taylor underlines, “You would basically die immediately in this atmosphere.”

- Oceanic thermal profile: Surface waters sustained temperatures above 40°C (104°F). - Chemical atmospheric state: High greenhouse gas concentrations persisted with zero free breathable oxygen. - Tectonic engine: Modern-style plate subduction and mantle recycling initiated modern continental foundations.

[23:51](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1431s) Neoarchean: Plate Tectonics and Prokaryotes

The Neoarchean initiated approximately 2.8 billion years ago. Even though the planet remained thoroughly inhospitable to higher life forms, the maturing machinery of plate tectonics steadily dredged up essential geochemical nutrients from the deep interior of the crust, delivering a diverse elemental buffet into the primordial seas. Primitive prokaryotic single-celled organisms, primarily early bacteria, leveraged these fresh chemical building blocks to expand and diversify across every aquatic frontier.

Yet, despite billions of years having already passed in real-world time, biology remained entirely restricted to microscopic scales. Steve Taylor laments the agonizingly slow pace of evolutionary complexity, pointing out, “But still, after so much time, we only have single cells.”

- Biochemical inputs: Deep mantle elements were introduced to marine ecosystems via active plate boundaries. - Organismal tier: The biosphere was strictly occupied by prokaryotic single cells colonizing oceans.

[27:46](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1666s) Siderian: The Great Oxidation Event

Arriving at 2.5 billion years ago, the Siderian period introduced the Great Oxidation Event, a planetary catastrophe that fundamentally transformed Earth’s terrestrial and atmospheric chemistry. Photosynthesizing cyanobacteria had been diligently releasing metabolic oxygen into the oceans for eons, but as natural mineral sinks became saturated, free oxygen finally spilled over into the open skies in unprecedented quantities.

This surge of atmospheric oxygen proved profoundly disruptive. When newly airborne oxygen encountered the ambient methane blanket, it reacted chemically to form carbon dioxide and water vapor, stripping the planet of methane’s superior heat-retention capacity and plunging the climate into a deep freeze. Summarizing the monumental scale of this bio-geochemical transition, Steve Taylor states, “Oxygen, burped out by cyanobacteria reaches the atmosphere in large quantities, paving the way for more complex life.”

```mermaid flowchart LR accTitle: The Great Oxidation Process accDescr: Sequence diagram showing cyanobacteria burping oxygen, methane collapse, and global glaciation. A["Cyanobacteria Activity"] -->|"Burps Oxygen"| B["O2 Sinks Saturated"] B --> C["Free Atmospheric O2"] C -->|"Reacts with Methane"| D["CO2 and H2O Formed"] D -->|"Greenhouse Collapse"| E["First Global Snowball Earth"] ```

[30:27](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1827s) Rhyacian: The First Huronian Glaciations

With the atmospheric greenhouse shield stripped away, Earth succumbed to the Rhyacian period roughly 2.3 billion years ago, freezing into a planetary snowball. Thick ice sheets encased the globe during a succession of crippling ice ages that dragged on across millions of uninterrupted years. This deep freeze was only broken when relentless, prolonged volcanic outgassing discharged enough carbon dioxide back into the atmosphere to warm the planet and trigger a global thaw.

As the glaciers melted, roaring floodwaters washed immense quantities of toxic elements and ground-up mineral runoff into the ocean basins. Yet, life demonstrated extraordinary biological resilience under extreme stress. As Steve Taylor observes regarding the tenacity of early organisms, “Melting ice flushes toxic elements into the oceans but life quietly puts up resistance and keeps evolving.”

- Climate state: Earth experienced prolonged planetary glaciation lasting tens of millions of years. - Termination mechanism: Volcanic carbon emissions eventually overpowered the reflective ice sheets, facilitating a slow planetary thaw.

[33:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2028s) Orosirian and Statherian: Giant Impacts and Natural Reactors

In the Orosirian period, around 2.05 billion years ago, a massive asteroid slammed into Earth's surface, carving out the Vredefort impact structure—the largest verified impact crater found on Earth. Simultaneously, early tectonic cratons converged into early supercontinental masses bearing names such as Ur, Nena, and Atlantica, their collisions crumbling the crust to thrust massive, jagged mountain belts skyward across multiple landmasses.

By 1.8 billion years ago, during the Statherian period, these shifting masses coalesced into the supercontinent Columbia. In the crust of modern-day Gabon, natural concentrations of uranium-235 reached critical mass within groundwater-saturated sandstone, igniting an astonishing geological marvel. Marveling at this phenomenon, Steve Taylor notes, “And a natural, self sustaining nuclear reactor awakes, just from scattered uranium deposits in the ground.”

- Impact geology: The Orosirian witnessed the creation of Earth’s largest verified impact structure (Vredefort). - Early supercontinents: Ur, Nena, and Atlantica collided, eventually forming the supercontinent Columbia. - Oklo phenomenon: Subterranean uranium deposits formed a self-sustaining natural nuclear fission reactor.

[39:37](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2377s) Calymmian: The Endosymbiotic Leap to Eukaryotes

At the threshold of the Calymmian around 1.6 billion years ago (give or take several hundred million years), life crossed its most decisive evolutionary threshold through endosymbiosis: two distinct single-celled organisms merged symbiotically, giving birth to the first complex eukaryotic cells containing defined nuclei and specialized organelles. Despite its revolutionary significance, this evolutionary leap appeared completely unspectacular to the naked eye.

As Steve Taylor wryly observes about this microscopic turning point, “One of the most important moments in the history of life. But yes, kind of looks not that impressive.” Meanwhile, the Earth's crust thickened, the supercontinental landmasses matured, and inland oceans receded into broad, shallow marine shelves where primitive, fungal-like organisms began unfurling tubular branching filaments.

- Evolutionary landmark: The formation of the eukaryotic cell through endosymbiosis introduced compartmentalized cell nuclei. - Ecological development: Marine basins grew shallower while primitive fungus-like structures began to explore benthic substrates.

[42:17](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2537s) Ectasian and Stenian: Solid Core and the Invention of Sex

During the Ectasian period roughly 1.4 billion years ago, Earth's internal core began crystallizing into a dense sphere of solid iron encircled by a swirling outer ocean of scorching liquid metal. The geologically late emergence of the solid inner core defies common intuition regarding planetary formation. Steve Taylor articulates this exact cognitive disconnect: “Weird, right? Feels like it should be older.”

Progressing to the Stenian period 1.2 billion years ago, macroscopic planetary dynamics seemed remarkably calm and static on the surface. However, a major biological revolution occurred within marine red algae known as *Bangiomorpha pubescens*, which pioneered sexual reproduction. By shuffling genetic material between individuals rather than relying on clonal division, sexual recombination drastically broadened biological variability, creating a powerful engine for adaptive evolution.

- Geophysics: The solid inner core crystallized only ~1.4 billion years ago, initiating ongoing interior growth. - Reproduction milestone: *Bangiomorpha pubescens* introduced eukaryotic sexual reproduction roughly 1.2 billion years ago.

[47:33](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2853s) Tonian: The Rise of Unicellular Predators

The Tonian period commenced approximately 1 billion years ago, yet to an outside observer, Earth still presented an austere, empty face of barren rock, tidal puddles, and barren marine horizons. Even after 3.5 billion years of planetary development, life remained completely imperceptible without a microscope. Steve Taylor reflects on the strange psychological weight of this realization, asking, “Life is still invisible to the naked eye. It does feel different to witness it like that, right?”

Underneath this quiet surface, the tranquility collapsed into ferocious microscopic warfare. The uncontested dominance of primitive bacteria dissolved as large eukaryotic cells developed phagocytosis and predatory feeding strategies. In response, prey organisms developed defensive microscopic mineralized armor, triggering the planet’s very first evolutionary arms race.

- Evolutionary ecology: The advent of active eukaryotic predators catalyzed structural arms races in the oceans. - Defensive morphology: Single-celled microorganisms developed microscopic mineral plates and skeletal casings for protection.

[51:14](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3074s) Cryogenian and Ediacaran: Snowball Earth and the First Giants

Roughly 720 million years ago, the Cryogenian period plunged the planet back into a catastrophic planetary glaciation, enshrouding global oceans in miles of ice. Paleontologists still puzzle over the precise survival mechanisms that carried primitive life through this extreme freeze. When the ice sheets retreated by 635 million years ago, the fragmented landmasses aggregated into the supercontinent Gondwana, vast geological fragments of which persist on modern world maps.

In the subsequent Ediacaran period, the biosphere underwent a sudden morphological revolution. For billions of years, life had been trapped in single-celled simplicity, but suddenly multicellular organisms expanded exponentially across the seafloor, exhibiting soft-bodied, bizarre alien architectures. Steve Taylor conveys the breathtaking transition: “Suddenly life gets big! In a hot second multicellular organisms become widespread!”

- Climate event: The Cryogenian saw the return of planetary "Snowball Earth" glaciations. - Plate configuration: Gondwana formed around 635 million years ago. - Biotic transition: The Ediacaran biota ushered in large-scale, complex multicellular body plans.

[53:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3215s) Cambrian Explosion: Life Diversifies and Discovers Land

The Cambrian explosion erupted 539 million years ago, unleashing an unprecedented wave of anatomical diversification in the marine fossil record. In an extraordinarily tight evolutionary window, the direct ancestral lineages of almost all modern animal phyla materialized, exhibiting hard exoskeletons, compound eyes, and specialized appendages. At the very same moment, pioneering green plants initiated tentative beachheads upon the damp terrestrial shores.

Steve Taylor captures the celebratory mood, noting, “Life is finally exciting! But of course a big mass extinction happens right after, killing most species in the ocean.” As the Ordovician drew to a close, a severe mass extinction swept through the marine biome, annihilating a vast swath of newly established oceanic species.

- Evolutionary pulse: The Cambrian explosion introduced nearly all extant animal body architectures (phyla). - Terrestrial invasion: Early photosynthesizers began leaving marine environments to conquer coastal land. - Extinction event: The end of the Ordovician eradicated the majority of marine species.

[55:01](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3301s) Devonian and Carboniferous: Forests, Vertebrates, and Coal

During the Devonian, primitive land plants spread across interior landmasses, fracturing bedrocks to produce deep planetary soils while consuming enormous quantities of atmospheric CO2. In doing so, they radically remodeled the global climate and biosphere. Dense forests emerged, and early lobe-finned fish crawled out of the shallow surf, transforming into tetrapods to explore terrestrial niches. Steve Taylor observes this rapid escalation, remarking, “Flora and fauna adapt better and better to life on land. We get trees and forrests, fish and the first vertebrate decide this land thing is something they need to try out!”

By the Carboniferous period, 359 million years ago, immense swampy rainforests covered the continents. Because wood-decaying organisms had not yet evolved enzymes capable of rapidly digesting lignin, fallen trees piled up in anoxic swamps without rotting. These vast deposits were buried under sediment and compressed over hundreds of millions of years, forming the extensive coal basins humanity burns today.

- Ecological transformation: Plants generated terrestrial soil profiles and dramatically drew down atmospheric carbon. - Vertebrate transition: Sarcopterygian fish evolved limbs, establishing the first terrestrial tetrapods. - Resource origin: Incompletely decomposed Carboniferous forests formed the coal seams that powered the Industrial Revolution.

[56:42](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3402s) Permian and Triassic: Pangaea and the Great Dying

By 299 million years ago, during the Permian, continental drift assembled the supercontinent Pangaea, uniting all major landmasses into a single unbroken expanse. Yet, after tens of millions of years of stability, the Permian ended in the most devastating biotic cataclysm in Earth's history: the Permo-Triassic mass extinction. Colossal volcanic flood basalts in the Siberian Traps erupted for hundreds of thousands of years, injecting catastrophic volumes of greenhouse gases and toxic ash into the atmosphere, which triggered runaway global warming, ocean acidification, and the annihilation of over 90% of marine species and 70% of terrestrial vertebrate families. Steve Taylor dryly quips, “Thanks volcanoes.”

From the ash of the Great Dying, the Triassic period commenced 252 million years ago. Life slowly pieced itself back together, and early archosaurs gave rise to the earliest true dinosaurs alongside primitive mammal ancestors. Summarizing life's relentless recovery after total devastation, Steve Taylor recites the classic sentiment, “Life, uhh, finds a way!”

```mermaid flowchart TD accTitle: Permian Extinction and Triassic Recovery accDescr: Flowchart showing Siberian Traps vulcanism, Great Dying, and Triassic recovery. A["Pangaea Supercontinent Formed"] --> B["Siberian Traps Flood Basalts"] B --> C["End-Permian Great Dying"] C -->|"90%+ Marine Species Extinct"| D["Triassic Biosphere Rebound"] D --> E["Emergence of Early Dinosaurs"] ```

[58:02](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3482s) Jurassic and Cretaceous: The Reign and Fall of Dinosaurs

By the Jurassic period, 201 million years ago, reptiles dominated all ecological tiers. Dinosaurs grew into titanic herbivores and apex carnivores, while the avian lineage emerged as feathered dinosaurs took to the air to explore the skies. The world blossomed into an abundant, temperate paradise, transitioning smoothly into the Cretaceous period where flowering plants spread across landscapes populated by familiar dinosaur lineages.

This verdant epoch came to a sudden, violent end 66 million years ago. A massive, ten-kilometer-wide asteroid slammed into the Yucatán Peninsula at Chicxulub, triggering global thermal pulses, wildfires, mega-tsunamis, and a pervasive impact winter that shut down photosynthesis worldwide. Capturing the sudden shock of this extinction, Steve Taylor exclaims, “Nothing can go wrong... wait, what's that? And an asteroid killed the dinosaurs and most species on Earth. Such a bummer.”

- Dominant fauna: Non-avian dinosaurs, pterosaurs, and marine reptiles held uncontested dominance. - Avian origin: Avian dinosaurs diversified alongside the expansion of early angiosperms (flowering plants). - Chicxulub impact: An asteroid collision terminated the Mesozoic era, extinguishing roughly 75% of all species.

[59:57](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3597s) Paleogene to the Present: The Mammalian Dawn

Following the demise of the non-avian dinosaurs, the Paleogene period commenced 66 million years ago, presenting a world where continental arrangements closely mirrored modern geography. With ecological niches abruptly emptied, small, nocturnal mammals rapidly diversified to occupy terrestrial, aerial, and marine habitats, eventually yielding the lineages of modern primates, ungulates, carnivores, and cetaceans. As Steve Taylor proclaims, “It is our time now!”

In the final seconds of the hour-long timeline, modern humans appear in an imperceptible flash. The entire documented span of human civilization, written records, conflicts, and achievements occupies nothing more than the final split-second before the presentation ends. Underscoring the extreme brevity of human existence compared to planetary time, Steve Taylor cautions, “Don't blink or you might miss all of human history!”

- Faunal radiation: Mammals diversified into all primary terrestrial and aquatic megafaunal niches. - Anthropological scale: Modern human evolution and all of recorded human history fit entirely within the final second of the hour-long timeline.

[01:00:53](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3653s) Kurzgesagt’s Decade-Long Celebration

The closing segment reflects on the sheer scope of the animation project itself, which required years of intermittent labor starting back in 2019 to finally premiere alongside Kurzgesagt's 10th anniversary. The creators emphasize that compressing billions of years of complex evolutionary, geochemical, and astronomical transitions into an accessible animated film was a labor of love, designed to evoke awe at our species' tiny footprint on an ancient planet.

Summarizing the philosophical takeaway of the entire journey, Steve Taylor meditates on the stark contrast between our youth and the age of the Earth: “Earth is ancient. We are new. So new.” Viewers are invited to support the studio by exploring their newly released Timeline of Evolution poster from the Education Edition series, which systematically charts the visual progression of life from single-celled blobs to modern ecosystems.

- Project history: Production spanned on-and-off development from 2019 through late 2023. - Studio milestone: The video serves as the official celebration of Kurzgesagt’s 10-year anniversary. - Accompanying material: An elaborately researched "Timeline of Evolution" poster was released in their shop to accompany the film.

## Notable quotes > [01:00:53](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3653s) Earth is ancient. We are new. So new. — Steve Taylor

> [30:27](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1827s) Melting ice flushes toxic elements into the oceans but life quietly puts up resistance and keeps evolving. — Steve Taylor

> [27:46](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1666s) Oxygen, burped out by cyanobacteria reaches the atmosphere in large quantities, paving the way for more complex life. — Steve Taylor

## Mentioned Kurzgesagt – In a Nutshell, Steve Taylor, Epic Mountain, Timeline of Evolution Poster, Theia, Vredefort impact structure, Bangiomorpha pubescens, Pangaea, Gondwana, Columbia, Siberian Traps, Chicxulub

## Video description Learn more about how complex life evolved with our new, elaborately detailed Timeline of Evolution Poster. Available only on the kurzgesagt shop here: https://shop.kgs.link/timeline

Sources & further reading: https://sites.google.com/view/sources-timeline/startseite?authuser=2

Earth is 4.5 billion years old - which is approximately the same amount of time it took us to create this video. We’ve scaled the complete timeline of our Earth’s life into our first animated movie! Every second shows about a million years of the planet’s evolution. Hop on a musical train ride and experience how long a billion years really is. It’s the perfect background for your next party, a great way to take a break from studying, or a fascinating companion while you’re on the go … and our celebration of 10 years of kurzgesagt.

OUR CHANNELS ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ German: https://kgs.link/youtubeDE Spanish: https://kgs.link/youtubeES French: https://kgs.link/youtubeFR Portuguese: https://kgs.link/youtubePT Arabic: https://kgs.link/youtubeAR Hindi: https://kgs.link/youtubeHI Japanese: https://kgs.link/youtubeJA Korean: https://kgs.link/youtubeKO

HOW CAN YOU SUPPORT US? ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ This is how we make our living and it would be a pleasure if you support us!

Get Products designed with ❤ https://shop-us.kurzgesagt.org Join the Patreon Bird Army 🐧 https://kgs.link/patreon

DISCUSSIONS & SOCIAL MEDIA ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ TikTok: https://kgs.link/tiktok Reddit: https://kgs.link/reddit Instagram: https://kgs.link/instagram Twitter: https://kgs.link/twitter Facebook: https://kgs.link/facebook Discord: https://kgs.link/discord Newsletter: https://kgs.link/newsletter

OUR VOICE ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ The Kurzgesagt voice is from Steve Taylor: https://kgs.link/youtube-voice

OUR MUSIC ♬♪ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ 700+ minutes of Kurzgesagt Soundtracks by Epic Mountain:

Spotify: https://kgs.link/music-spotify Soundcloud: https://kgs.link/music-soundcloud Bandcamp: https://kgs.link/music-bandcamp Youtube: https://bit.ly/49vGl2L Facebook: https://kgs.link/music-facebook

The Soundtrack of this video: Soundcloud: https://bit.ly/3u6XNdV Bandcamp: https://bit.ly/46bxD7i

If you want to help us caption this video, please send subtitles to subtitle@kurzgesagt.org You can find info on what subtitle files work on YouTube here: https://support.google.com/youtube/answer/2734698?hl=en-GB&ref_topic=7296214 Thank you!

🐦🐧🐤 PATREON BIRD ARMY 🐤🐧🐦 ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ Many Thanks to our wonderful Patreons (from http://kgs.link/patreon) who support us every month and made this video possible: robek, Brad Christensen, Asija Newns, Pedro Castro Verdezoto, Lucas Watkins, damien perolle, Fab Cars, alomanola, MikyF2K, Mithilesh Hinge, okor, Lucan, The Gnome, Kyung Geun Kim, Misa Brass, Martin Hippenstiel, Morgan, Anthony Distel, Filip Rogowski, Gabe, Tobias Hofmann, Zaret, Bootools, David Earl, Ben Hamilton, still [Redacted], polyploidy, Elgenzay, Jared, Soda celeste, Felix, Benjamin Goodrich, Taher Rangwala, Jesse Barnes, WillowTree, DarkKot 686, Aaron Phillips, Luc Royal, Lukas Meier, esamoth, Smithius, Mermor, Laura Kühne, Tyler Fendone, gassi30, Andres Arce, Suzanne frounfelter, Akito Nozaki, SirRender, Space, Daniel Hofmeister, Dan M, Jacob Culp, ReyesX77, Aaron T Haltman, DJ Dubbes, SchnarcheNoah, Keira Standing, Steven Lamontagne, Bliss, David Anderson, Uhh Uhhh Uhhh, The Paul Family

0:00 Intro 0:51 Hadean 8:04 Eoarchean 13:20 Paleoarchean 18:35 Mesoarchean 23:51 Neoarchean 27:47 Siderian 30:24 Rhyacian 33:42 Orosirian 36:58 Statherian 39:38 Calymmian 42:15 Ectasian 44:52 Stenian 47:30 Tonian 51:12 Cryogenian 52:18 Ediacaran 53:35 Cambrian 54:17 Ordovician 54:49 Silurian 55:08 Devonian 55:55 Carboniferous 56:43 Permian 57:21 Triassic 58:02 Jurassic 58:46 Cretaceous 59:48 Paleogene 1:00:21 Neogene 1:00:38 Quaternary 1:00:45 Ending

[Source](https://www.youtube.com/watch?v=S7TUe5w6RHo)

中文简报

Kurzgesagt地球时间线将整个人类历史置于最后一秒微观生物主宰地球超过三十亿年，使得有记载的人类历史完全在地质时间的弹指一瞬中展开。该片记录了地球的编年历程，涵盖其剧烈的熔融吸积、形成月球的巨大碰撞，以及单细胞原核生物在有毒缺氧海洋中生存的数十亿年。它追溯了关键的演化转折点，包括大氧化事件、真核细胞的出现，以及埃迪卡拉纪与寒武纪大爆发期间复杂多细胞生命的剧增。在回顾了恐龙的统治与大灭绝之后，时间线以哺乳动物的快速多样化收尾，展现了整个人类有记录的历史仅仅在最后一秒的极短瞬间中掠过。 Kurzgesagt将地球整整45亿年的历史浓缩进一部精确校准的一小时视频中，其中每一秒大约代表150万年的地质与生物演变。 (0:00) 微观单细胞生命主宰了地球生物圈长达35亿年以上，而复杂的多细胞生物直到时间线的最后十分钟才显现出可见的扩张。 (47:33) 大约25亿年前的大氧化事件使蓝细菌产生的氧气取代了大气中的甲烷，导致地球温室效应崩溃，并引发了持久的全球性冰期。 (27:46) 现代人类及有记载人类文明的全部跨度，仅占这一小时地质历程的最后弹指一瞬。 (59:57)

Reading summary

Kurzgesagt models Earth’s 4.5-billion-year history as a one-hour journey—calibrated at roughly 1.5 million years per second—to illustrate how planetary dynamics and microscopic organisms dominated deep time long before complex life and humanity emerged. Geochemical Volatility and Planetary Formation (0:41) Earth’s opening epochs were defined by extreme astronomical and geochemical shifts. Following an initial molten state, a collision with the Mars-sized body Theia generated the debris that accreted into the Moon. Although the young Sun produced approximately 30% less luminosity than today, dense concentrations of greenhouse gases trapped sufficient heat to sustain hot surface conditions, while persistent rains gradually pooled into early oceans. As plate tectonics matured during the Mesoarchean around 3.2 billion years ago, continental crust assembled through subduction and crustal recycling, even as oceans bubbled above 40°C beneath an oxygen-free sky. Earth's internal structure also continued to evolve; its solid iron inner core only began crystallizing around 1.4 billion years ago. The Prolonged Reign of Microscopic Life (8:16) For over three billion years, biological activity remained exclusively single-celled. Emerging around 4 billion years ago near hydrothermal vents or shallow waters, early prokaryotes steadily colonized marine ecosystems. Photosynthetic microbes produced Earth's earliest macro-fossils, stromatolites, by 3.5 billion years ago. Around 1.6 billion years ago, endosymbiosis united separate single-celled organisms into compartmentalized eukaryotic cells. Genetic diversity accelerated roughly 1.2 billion years ago when the red alga Bangiomorpha pubescens introduced sexual reproduction. By 1 billion years ago, predatory eukaryotes engaged in phagocytosis, triggering defensive skeletal adaptations and the planet's first microscopic arms races. Biogeochemical Disruptions and Mass Extinctions (27:46) Biological innovations periodically triggered worldwide environmental crises. Around 2.5 billion years ago, the Great Oxidation Event occurred when cyanobacteria saturated mineral sinks and released vast quantities of molecular oxygen into the atmosphere. This oxygen reacted with ambient methane, collapsing the greenhouse shield and driving Earth into prolonged Huronian glaciations. Similar Snowball Earth conditions returned during the Cryogenian around 720 million years ago. Later macro-scale extinctions repeatedly culled complex life: the end-Permian Siberian Traps eruptions released massive volcanic greenhouse gases, killing over 90% of marine species and 70% of terrestrial vertebrate families. Later, the Chicxulub asteroid impact 66 million years ago eradicated roughly 75% of species, including non-avian dinosaurs. Multicellular Radiation and the Terrestrial Frontier (53:35) Large, complex body architectures emerged relatively late. Following the Ediacaran biota, the Cambrian explosion 539 million years ago rapidly introduced modern animal phyla equipped with mineralized exoskeletons and specialized appendages. Primitive plants established terrestrial beachheads, followed by Devonian forests that deepened continental soils and drew down atmospheric carbon. Unrotted Carboniferous vegetation settled into anoxic swamps, forming the coal beds used in modern industry. Vertebrates transitioned from lobe-finned fish to land-dwelling tetrapods, yielding the successive dominance of archosaurs, dinosaurs, and ultimately mammals, which diversified rapidly following the Cretaceous extinction. Narrator Steve Taylor reflects that against Earth's 4.5-billion-year timeline, modern humans and recorded history appear entirely within the final fraction of a second, underscoring human civilization's extreme brevity relative to planetary deep time.

精炼阅读摘要

Kurzgesagt与解说员Steve Taylor通过将地球45亿年历史压缩为1小时动态实验（每秒约合150万年）指出，地球漫长演化的绝大部分时间都由极端地质剧变与微观单细胞生物主导，而人类全部文明史仅占据该进程的最后瞬间。深时压缩模型与地狱般的冥古宙开端 (0:00) 人类认知难以直观理解45亿年的宏大跨度。为了建立尺度感知，该视频构建了一趟历时60分钟的“音乐列车”，外部景观以每秒约1.5百万年的换算率展示地球全貌。行星的起点是一片翻滚着熔岩的炽热地狱。在原初地球演化早期，一颗名为Theia的火星大小天体与地球相撞，飞溅出的吸积碎片盘迅速汇聚形成月球，其在早期近地轨道上显得异常巨大，并在随后数亿年的潮汐力作用下逐步远离，缩小至现代所见尺寸。距今45亿年前，地球步入以希腊冥王命名的冥古宙。在二氧化碳高浓度的大气层笼罩下，岩浆洋覆盖地表数千万年。虽然活跃的地壳循环几乎抹去了这一时期的直接地质岩石痕迹，但残留至今的微观锆石晶体保存了地化学证据，表明即使在烈火般的初生混沌环境中，局部已开始积聚极早期的液态水储层。地质动力运转与原初生命的化学摇篮 (6:48) 在太阳系形成早期，幼年太阳的光度比现代低约30%，然而地球表面并未冻结，反而在巨量温室气体的阻隔保暖下维持了相当高的温度，并在其间承受了无数小行星撞击的“晚期重轰炸”。随后持续数百万年的倾盆大雨冷却了地壳，汇聚成覆盖大部分星球的初始海洋。在距今约40亿年前的始太古代，生命开始萌芽。解说员Steve Taylor强调，深海中喷涌灼热矿物流体的热液喷口可能是生命最初起源的化学温床，但确切机制与地点仍属推测。到了古太古代（约36亿至32亿年前），由于自转速率远高于今天，地球的单日时长明显偏短。单细胞微生物在此期间聚集构建出垫状沉积沉积构造——叠层石，留下了人类目前可知最早的宏观微生物化石记录，光合作用也于该阶段开始破晓。中太古代（约32亿年前）则启动了现代风格的板块构造板块俯冲和地幔循环，使大陆板块逐步成型。海洋如同40摄氏度以上的沸腾温水池，但大气中依旧充满极端致命的温室气体，没有任何可供人类呼吸的分子氧。大氧化环境浩劫与真核生物演化跃迁 (27:46) 距今约25亿年前的成铁纪发生了大氧化事件。蓝细菌经过漫长岁月释放的副产物氧气在使海洋矿物吸收宿饱和后，不可逆地涌入开放大气层。游离氧气迅速与高浓度甲烷反应生成二氧化碳与水蒸气，急剧削弱了地球原有的强力温室效应，直接导致成铁纪与随后的层侵纪（约23亿年前）陷入冰封全球的休伦冰期“雪球地球”。这一冰封状态历经数千万年，直至剧烈的长期火山排气释放出足够的二氧化碳，才推动全球缓慢解冻并冲刷巨量矿物质入海。严酷环境并未消灭生命，反而在微观层面促成跃迁。在随后的盖层纪（约16亿年前），通过两个单细胞生物的内共生融合，演化出了首批拥有细胞核与特化细胞器的真核生物。约14亿年前的延展纪，地球内部核心开始结晶为固态铁球；到了狭带纪（约12亿年前），红藻Bangiomorpha pubescens率先发展出有性生殖，通过基因重组彻底摆脱了单调的克隆分裂，为生物变异与适应性演化注入了强劲动力。到约10亿年前的拉伸纪，大型真核捕食者的吞噬行为与猎物的矿化装甲催生了生物界首次微观军备竞赛。多细胞爆发、陆地征服与周期性大灭绝在距今7.2亿年前的成冰纪经历第二次全球雪球冰期后，埃迪卡拉纪（约6.35亿年前）的地层中突然广泛涌现出形体怪异的软躯体大型多细胞生物。紧随其后的寒武纪大爆发（约5.39亿年前）在极短窗口期内展现出现代几乎所有动物门类的身体构造蓝图，伴随坚硬外骨骼与复眼的形成。尽管奥陶纪末期发生了造成大部分海洋物种灭绝的灾难，植物依然在泥盆纪向陆地深处扩张，形成深厚土壤并吸收大量二氧化碳，肉鳍鱼类也逐渐演变为四足脊椎动物。在石炭纪（约3.59亿年前），由于缺乏能够快速分解木质素的生物酶，倒伏的巨大热带沼泽森林在缺氧环境中无法腐烂，被沉积层深埋压实数亿年后，最终形成了驱动工业文明的现代煤炭盆地。距今约2.52亿年前的二叠纪末期，西伯利亚暗色岩超级火山喷发造成了地球历史上最严酷的大灭绝事件，消灭了超90%的海洋物种和70%的陆生脊椎动物家族。生命在三叠纪逐渐复苏，并由此拉开恐龙家族跨越侏罗纪与白垩纪的统治序幕，直至6600万年前希克苏鲁伯（Chicxulub）小行星撞击引发全球核冬天并终结中生代。哺乳动物崛起与末秒人类文明的微小尺度 (59:57) 非鸟类恐龙彻底消亡后，新生代古近纪（6600万年前）大陆格局已趋近现代分布。空置的生态位促使小型夜行哺乳动物急剧辐射演化，全面进占陆地、天空与海洋各生态级次，并最终衍生出灵长类、鲸类与食肉动物等现代庞大生物群。在这部压缩为一小时的宏大地史旅程中，现代人类的出现与全部有文字记载的文明发展、冲突与成就，被浓缩在视频结束前极其短暂的最后一秒之内。这种极端的物理压缩比例直观揭示了人类文明在漫长地质时间尺度面前的渺小，凸显出整个人类物种作为地球客体的绝对年轻性。该内容系统勾勒出地球环境与生命形态历经数次绝灭再造的交替规律，但生命起源的具体机制及雪球地球期间生物存续的精确途径在地质学与古生物学界仍存疑问。该项目耗时数年制作，旨在通过时空压缩引发公众对物种存在脆弱性与地球古老历史的敬畏。

Detailed notes — zh

## Background 该视频由知名科普频道 Kurzgesagt – In a Nutshell 于 2023 年 11 月 10 日发布在 YouTube 平台上，作为庆祝频道成立十周年的特别纪念作品。视频简介指出，团队将地球整整 45 亿年的演化史浓缩在 1 小时的首部动画长片中，以每秒代表约 100 万至 150 万年的比例，带领观众搭乘音乐列车感受地质时间的漫长尺度。 ## TL;DR 视频以一趟虚拟列车为视窗，从 45 亿年前冥古宙的熔岩地狱与忒伊亚大碰撞讲起，梳理了原始海洋孕育、微观生命萌芽与大氧化事件导致冰封雪球的漫长历程。在前近 40 亿年的绝大部分岁月中，地球始终被单细胞生物与荒凉岩石主导，直到寒武纪生命大爆发才迎来肉眼可见的多细胞物种井喷。在历经植物登陆、石炭纪森林聚积以及恐龙的兴盛与灭绝后，哺乳动物最终接管生态位，而整个人类历史在长达一小时的演化轴线上仅仅占据了最后转瞬即逝的几秒。 ## Atmosphere & style 整个观影过程犹如一场宏大而沉静的宇宙冥想，Epic Mountain 制作的背景音乐与窗外持续变幻的史前地貌构建出一种深邃的沉浸感。旁白史蒂夫·泰勒（Steve Taylor）一如既往地保持着冷面幽默与平实质朴的口吻，在数亿年的枯燥荒凉与突如其来的灭绝灾难之间适时吐槽，既消解了极端地质剧变的压迫感，又带来强烈的反差萌。从最初面对数十亿年单细胞泥淖时的荒芜渺小，到片尾哺乳动物崛起与人类文明转瞬即逝的急促感，整部作品给观众带来一种震撼心弦的时间眩晕感与对生命韧性的深深敬畏。 ## Bulletin - [00:00](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=0s) Kurzgesagt 建立了一套尺度转换模型：将地球 45 亿年历史压缩至 1 小时，每播放 1 秒对应约 150 万年的地质岁月。 - [52:12](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3132s) 生命耗费了近 40 亿年的单细胞漫长蛰伏，直到约 6.35 亿年前的埃迪卡拉纪与寒武纪才迎来多细胞巨型化与物种大爆发。 - [42:15](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2535s) 地球固态内核的结晶凝固发生得相对较晚，距今仅约 14 亿年前才在地心深处由液态铁凝固成型。 - [59:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3588s) 在整整 1 小时的地质历史长卷中，人类的起源、文明演进与现代工业社会的全部历史仅仅占据了最后几十秒的短暂一瞬。 ## Key takeaways - [00:00](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=0s) 冥古宙早期，火星大小的天体忒伊亚与原始地球剧烈碰撞，飞溅的物质聚合成月球，彼时月球视直径极大且地表全为熔岩。 - [02:06](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=126s) 尽管太阳早期光度比现代低约 30%，但大气中浓度极高的温室气体使地球维持高温，古老锆石微粒证明当时局部已存在液态水。 - [08:04](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=484s) 始太古代时期地表持续降温引发数百万年暴雨形成原始海洋，深海热液喷口周围成为最初单细胞生命萌芽的理想温床。 - [13:20](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=800s) 古太古代的叠层石化石提供了生命存在的最早切实证据，早期生物也开始尝试利用太阳能进行原始光合作用。 - [18:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1115s) 中太古代板块构造碰撞与俯冲机制确立并奠定大陆地壳基底，当时海洋水温普遍超过 40 摄氏度且大气完全不含游离氧。 - [23:51](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1431s) 蓝细菌光合作用引发成铁纪大氧化事件，游离氧气将大气甲烷降解，温室效应崩塌导致地球陷入数百万年的全球冰封雪球期。 - [30:24](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1824s) 造山纪与固结纪见证了地球最大撞击坑的形成与哥伦比亚超大陆聚拢，奥克洛等地的天然铀矿甚至自发启动了自持核反应堆。 - [39:38](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2378s) 盖层纪单细胞生物通过内共生形成拥有独立细胞核的真核细胞，奠定了后续所有复杂动植物演化的细胞学基础。 - [44:52](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2692s) 狭带纪拟纤细红藻率先确立有性生殖机制；随后的拉伸纪出现单细胞捕食者，打破细菌垄断并迫使微生物演化出微观防御装甲。 - [51:12](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3072s) 成冰纪经历全球极寒后，埃迪卡拉纪生命突然突破微观限制，大型扁平柔软的多细胞生物迅速占据海洋。 - [53:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3215s) 寒武纪生命大爆发涌现出几乎所有现代动物门类的祖先，随后植物与早期四足脊椎动物向陆地进军并彻底改变地表生态。 - [55:55](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3355s) 石炭纪未分解的巨型蕨类与森林深埋地下形成了现代煤炭矿藏；随后二叠纪末期超级火山大喷发引发了地球史上最惨烈的生物大灭绝。 - [57:21](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3441s) 中生代恐龙占据绝对统治地位，直到白垩纪末期尤卡坦半岛遭受小行星致命撞击，哺乳动物随后在古近纪迅速接管陆地生态位。 - [59:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3588s) 相较于地球 45 亿年的沧桑演变，人类文明的历史短促得如同一瞬，展现出宏观地质时间尺度与人类存在之间的巨大反差。 ## Detailed walkthrough ### [00:00](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=0s) 地球时间列车：冥古宙与月球诞生地球拥有 45 亿年的漫长历史，这一数字庞大到人类的大脑根本无法真正具象化理解。为了建立直观感受，视频构建了一场尺度实验：将整个地球历史压缩进 1 小时内，车窗外的画面每走过 1 秒，就代表大约 150 万年的地质岁月流逝。观众如同坐在一列伴随音乐前行的观光列车上，向外眺望十亿年尺度的行星沧桑变迁。视频旁白指出，在这趟列车上，观众可以将其作为学习背景音，也可以单纯享受这段旅程，而他会不时插话解说关键节点。大约 45 亿年前，地球刚诞生不久，整个地表宛如一片翻滚的岩浆地狱。在历史非常早期的阶段，一颗名为忒伊亚（Theia）、体积堪比火星的天体与原始地球发生了剧烈大碰撞。这次撞击喷射出的物质逐渐凝聚，形成了如今我们在夜空中看到的月球。在当时的夜空中，刚诞生的月球距离极近、显得无比庞大；在接下来的数亿年里，随着它的轨道逐渐远离地球，月球才在天空中慢慢缩小。这一时期正是地球的第一个宙——冥古宙（Hadean），该名称源自希腊神话中的冥界之神哈迪斯（Hades）。此时的大气层几乎完全由二氧化碳（$\text{CO}_2$）主导，地面全由炽热熔岩铺就。这部分地质记录对现代人类而言几乎完全不可见，因为那个时代的原始岩石几乎没有完好留存至今。 - 尺度换算：视频播放每 1 秒对应约 150 万年地质演化史，1 小时总览 45 亿年。 - 忒伊亚碰撞：火星大小的天体撞击原始地球，飞溅物质形成月球。 - 早期月球视直径极大，随着轨道向外迁移，在数亿年间逐渐变小。 - 冥古宙环境：命名取自冥王哈迪斯，大气富含 $\text{CO}_2$，地表全为熔岩。 ### [02:06](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=126s) 漫长冷却、锆石证据与晚期重轰炸随着列车平稳向前行驶，转眼间 9000 万年已经过去，但车窗外依旧是无休止的熔岩炼狱。正如旁白所提醒的那样：“Settle in, this will take a while.”（坐稳了，这需要漫长的时间。）然而，在这片看似绝无生机的炼狱深处，科学家发现了名为锆石（Zircon）的古老矿物微粒，这些矿物的同位素与化学特征表明，早在这一时期，地球上可能就已经存在局部液态水。在年轻的太阳系初期，地球以及内太阳系各大行星经历了长达数亿年持续而密集的小行星轰击，即著名的晚期重轰炸期。彼时的太阳尚处于青年期，发出的光度比今天弱大约 30%；但由于地球大气中充斥着浓度极高的温室气体，强烈的温室效应反而让整颗行星处于极其温热甚至舒适的状态。 - 锆石矿物发现：为冥古宙极端高温下可能存在液态水提供了关键地球化学线索。 - 弱太阳佯谬背景：当时太阳亮度比现在低 30%，但巨量温室气体锁住热量，使地表维持高温。 - 持续数亿年的小行星撞击不断翻犁、重塑内太阳系行星的地表构造。 ### [08:04](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=484s) 太古宙黎明：海洋成型与原初生命列车驶入距今约 40 亿年前的太古宙起始阶段（始太古代，Eoarchean）。大约在此时，生命悄然登上了历史舞台。在宇宙万物开端仅几亿年之后，最初的单细胞生物便开始在这颗依旧极为致命的行星上繁衍扩散。与此同时，地球表面持续冷却，天空倾盆降下可能持续了数百万年的漫长暴雨。这些降水汇聚填平了低洼地带，形成了最初的原始海洋，将年轻的地球包裹在一片汪洋之中。深海海底分布着活跃的热液喷口（Hydrothermal vents），滚烫且富含矿物质的地热流体从裂隙中不断涌出。科学界推测，这些深海热泉周围稳定、高能且富含有机化学成分的环境，极有可能就是生命最初诞生与孕育的摇篮，尽管目前的科学界尚未彻底证实这一点。 ```mermaid flowchart TD accTitle: Origin of Primordial Oceans and Life accDescr: Earth cools down, triggering continuous rain that forms oceans, while undersea hydrothermal vents provide conditions for early life. subgraph S1["大气与降温过程"] A["地表持续冷却"] --> B["数百万年持续暴雨"] B --> C["原始海洋成型"] end subgraph S2["深海化学生命孕育"] D["海底热液喷口"] --> E["涌出炽热矿物质流体"] E --> F["原初单细胞生命萌芽"] end C -.-> D ``` ### [13:20](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=800s) 古太古代：叠层石与光合作用初现列车继续穿行，漫长岁月流逝，地球进入古太古代（Paleoarchean）。此时此刻，视频旁白对一直坚持观看到这里的观众致意：“Good job if you are still watching. You witnessed a billion years so far.”（如果你还在看，干得漂亮。到目前为止你已经见证了整整十亿年。）此时的地表绝大部分依然被海水覆盖，而在深不见底的海水之下，最早的超大陆正在悄然孕育。由于早期地球自转速率比现在快得多，当时一天的时长要显著短于当下的 24 小时。地质学家在该时期的地层中发现了珍贵的叠层石（Stromatolites）化石——它们是由远古微生物分泌黏液并捕获沉积物颗粒逐层硬化而成的沉积岩结构，构成了地球生命存在的最早切实证据之一。与此同时，生命形式开始尝试直接利用太阳能，原始的光合作用可能早在这一时期就已经萌芽。 - 地球自转：早期自转速度极快，单日昼夜周期明显短于现代。 - 超大陆胚胎在浩瀚海洋深处缓慢孕育。 - 叠层石结构记录了早期微生物群落的生活遗迹，是地球生命最早的实体化石证据之一。 - 原始光合作用初现端倪，生物开始捕获太阳辐射转化为化学能。 ### [18:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1115s) 中太古代：板块碰撞与沸腾热汤海洋距今约 32 亿年前的中太古代（Mesoarchean），大陆板块演化的时代拉开序幕。各大构造板块开始剧烈碰撞、推挤，部分板块被强行俯冲拖拽进地球深部地幔并彻底熔融，为今天的大陆构造奠定了核心骨架基底。当时的海洋温度极高，宛如一个巨大的热水浴缸，水温常年超过 40 摄氏度。微生物在温热的海水中疯狂向各处扩散。由于当时地球上还没有任何陆生植物来吸收温室气体，大气中堆积着巨量保温气体，使整个行星环境酷热难耐。旁白直白地描绘这种致命环境：“You would basically die immediately in this atmosphere.”（你若是置身于这样的大气中，基本会立刻毙命。）此时的大气中甚至没有一丝一毫的游离氧气。 - 大陆演化基石：板块挤压与俯冲消亡机制成型，奠定大陆地壳基础。 - 海洋水温普遍超过 40°C，如同高热热水澡盆。 - 无植物吸收温室气体，大气充斥浓密窒息气体，完全不含游离氧气。 ### [23:51](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1431s) 新太古代与成铁纪：大氧化事件与冰封地球距今约 28 亿年前，新太古代（Neoarchean）来临。尽管地球依然是一个环境极其恶劣的险境，但随着成熟板块构造机制的确立，来自地幔深处的矿物与化学成分被源源不断地泵送到地表环境中，原始生命得以利用这些丰富的新原料合成各类复杂化合物。大约在此前后，以细菌为代表的原核生物（Prokaryotes）开始广泛殖民整颗星球，生命的物种多样性持续提升。然而令人感慨的是，在经历如此漫长的时间后，地球上所有的生命形式依然停留在最简单的单细胞阶段。距今约 25 亿年前的成铁纪（Siderian），一场将彻底重塑整颗星球面貌的剧变拉开帷幕——大氧化事件（Great Oxidation Event）。蓝细菌（Cyanobacteria）通过光合作用“打嗝”般大量释放出的游离氧气涌入大气，为日后更复杂生命的诞生铺平了道路。然而，新进入空气的大量氧气迅速与原本占据主导地位的强效温室气体——甲烷发生氧化反应，转化成保温能力弱得多的二氧化碳和水。温室效应断崖式下跌，行星急剧降温。这极有可能是地球历史上第一次被厚厚冰层全面覆盖，开启了长达数百万年的多轮全球冰期。 - 原核生物大扩散：经历十余亿年演化后，生物界依旧全部由微观单细胞构成。 - 大氧化事件爆发：蓝细菌光合作用释放海量氧气。 - 甲烷被氧气氧化降解为 $\text{CO}_2$ 和 $\text{H}_2\text{O}$，行星保温层失效。 - 极端降温诱发全球性冰期，开启冰封雪球状态。 ### [30:24](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=1824s) 层侵纪与造山纪：解冻、巨型陨石坑与天然核反应堆距今约 23 亿年前，层侵纪（Rhyacian）接踵而至。剧烈的火山喷发向大气重新灌注了巨量温室气体，地球在漫长时间中缓慢解冻。融化的冰川将巨量有毒重金属和矿物元素冲刷进海洋中，但顽强的原始生命默默抵抗着极端环境的冲击，并在毒素与恶劣水质中持续演化。时间推进至距今约 20.5 亿年前的造山纪（Orosirian），一颗巨大的外来小行星凶猛撞击地球，砸出了地球迄今已证实的最大撞击构造（弗里德堡陨石坑结构）。在同一时期，地球各处的大陆板块相互猛烈挤压，推挤出一道道巍峨的山脉；这些古老陆块拥有极为奇特的名字，诸如“乌尔”（Ur）、“妮娜”（Nena）或“亚特兰蒂卡”（Atlantica）。距今约 18 亿年前的固结纪（Statherian），早期超大陆“哥伦比亚”（Columbia）宣告聚拢成型。极其奇妙的是，大约在这一时期，仅凭地层中富集分散的天然铀矿沉积物，地球在奥克洛等地区自发苏醒启动了天然的自持核反应堆，在地下深处持续运转。 - 地热解冻：密集火山活动释放气体升温，冰川融水将有毒微量元素洗刷入海。 - 巨型撞击：造山纪时期发生已知规模最大的地外天体陨石撞击事件。 - 早期陆块碰撞造山：Ur、Nena、Atlantica 等古大陆互相挤压形成巨大山脉。 - 哥伦比亚超大陆聚拢成型。 - 天然核反应堆：铀矿沉积在无人工干预下自然达到临界状态并运转。 ### [39:38](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2378s) 盖层纪与延展纪：真核生物与地核结晶距今约 16 亿年前，在盖层纪（Calymmian）前后（误差浮动在数亿年左右），生命演化史上最关键的里程碑之一悄然达成：两个不同类型的原始单细胞生物发生吞噬与内共生，融合成拥有独立细胞核的真核细胞（Eukaryotic cells）。旁白评价道：“One of the most important moments in the history of life. But yes, kind of looks not that impressive.”（这是生命历史上最重要的时刻之一。不过确实，外观上看起来并没那么起眼。）此时的地球生命在肉眼观察下依然只是微不足道的单细胞黏液。随后，地壳厚度不断增加，沉重稳定的大陆成型，海洋水深相对变浅。最早的类真菌生物也在此阶段伸展出管状菌丝，开始履行真菌分解者的生态职能。时间来到距今约 14 亿年前的延展纪（Ectasian），地球物理层面发生了一件意想不到的重大变化——地球固态内核开始形成。旁白感叹道：“Weird, right? Feels like it should be older.”（很怪对吧？感觉它应该更古老才对。）地心深处的液态铁在超高压与逐渐降温下开始凝固，结晶成为一个被炽热液态金属外核环绕的巨大铁晶体球，并在随后的岁月中不断壮大。 - 内共生事件：真核细胞诞生，奠定复杂动植物演化的细胞学基础。 - 早期类似真菌的管状生物在浅海与沉积物中蔓延。 - 地球内核心形成：距今约 14 亿年前才由液态铁结晶凝固出固态金属内核。 ### [44:52](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=2692s) 狭带纪与拉伸纪：性别的发明与微观捕食军备竞赛距今约 12 亿年前的狭带纪（Stenian），整颗行星看似平静无事，地质活动相对平缓。然而，微观世界发生了一场影响深远的革命：一种名为红藻门拟纤细红藻（*Bangiomorpha pubescens*）的藻类生物疑似最先发明了有性生殖（Sex）。性别的诞生在基因重组与物种变异层面带来了多方位的繁殖巨大跃升。距今约 10 亿年前，拉伸纪（Tonian）开启。整颗地球在地表尺度上依然由冰冷的裸岩、水洼与汪洋构成，生命在肉眼直视下依然毫无痕迹。然而在显微镜下，微观生态却在经历残酷重组：单细胞捕食者开始出现。细菌一家独大的垄断时代彻底终结，体格更大的真核生物在海洋生态位中插上了主导旗帜。微生物之间爆发了你死我活的生存军备竞赛，进而催生出前所未有的形态多样性，部分微生物为了自保甚至演化出了微观防御骨板与外骨骼装甲。 ```mermaid flowchart LR accTitle: Evolution of Microscopic Predation and Defense accDescr: The emergence of unicellular predators ends bacterial dominance and triggers an evolutionary arms race where microbes develop defensive armor. A["单细胞捕食者崛起"] --> B["真核生物争夺海洋主导权"] B --> C["微观生存军备竞赛"] C --> D["细胞形态与外壳装甲多样化"] ``` - 拟纤细红藻（*Bangiomorpha pubescens*）可能率先确立有性生殖方式。 - 肉眼可见层面上，地球在长达十亿年间依旧呈现岩石与水体的荒凉外貌。 - 单细胞捕食机制成型，打破细菌统治，迫使被捕食者演化出微观装甲防御结构。 ### [51:12](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3072s) 成冰纪与埃迪卡拉纪：冰封绝境与多细胞巨型化距今约 7.2 亿年前的成冰纪（Cryogenian），地球再次陷入全温极寒，冰层一路蔓延封冻至赤道。面对这种频繁到令人无奈的极寒轮回，旁白调侃道：“Sure why not. How did life survive? We are not sure.”（行吧，有何不可呢。生命究竟是怎么挺过来的？我们其实也不太确定。）距今约 6.35 亿年前，著名的冈瓦纳超大陆（Gondwana）拼合聚集，其残余地块至今仍构成了南半球大陆的核心。紧接着，生命形态迎来了石破天惊的大爆发：突然之间，体型微小的生命开始变大。在极短的地质瞬间内，大型多细胞生物迅速占领了海洋。尽管埃迪卡拉纪（Ediacaran）的这些奇异生物宛如来自外星的异形，结构扁平柔软且形态怪诞，但人类很难想象，地球竟耗费了将近 40 亿年的单细胞漫长蛰伏，才最终换来多细胞巨型生命的绽放。 - 雪球地球重临：成冰纪全球再次冰封，生命在冰下极端庇护所艰难求存。 - 冈瓦纳超大陆拼合：奠定现代多块大陆地质前身。 - 埃迪卡拉生物群：多细胞生物体型呈指数级放大，构造形态奇特如地外异形。 ### [53:35](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3215s) 显生宙爆发：古生代陆地征服与石炭纪巨木森林距今约 5.39 亿年前，寒武纪生命大爆发（Cambrian explosion）轰然引爆，海洋中各类生命形态呈现井喷式激增。当今地球上几乎所有现存主流动物门类的祖先都在这一狭窄的地质窗口期集体亮相，与此同时早期植物也开始尝试探索陆地边沿。正如旁白所感叹：“Life is finally exciting! But of course a big mass extinction happens right after, killing most species in the ocean.”（生命终于变得精彩刺激了！但紧接着当然就是一场大规模灭绝事件，杀死了海洋中大部分物种。）随后的奥陶纪、志留纪与泥盆纪中，植物向陆地纵深大举进军，通过根系风化岩石形成最初的土壤，并通过捕食吸收 $\text{CO}_2$ 彻底重构了地球大气循环。演化进程陡然加速：地表长出了高大的树木与茂密原始森林，水下鱼类日益繁盛，第一批脊椎动物做出了登陆的伟大决断。距今约 3.59 亿年前的石炭纪（Carboniferous），郁郁葱葱的巨型蕨类森林与沼泽湿地发展到鼎盛。这些死后沉入缺氧水底而无法被快速分解的远古巨木残骸，最终深埋地底转化为如今人类为了取暖和工业所疯狂开采燃烧的煤炭资源。地质时间尺度的演化节拍在此刻变得无比迅疾。 - 寒武纪大爆发：现代绝大部分动物门类的祖先在极短窗口内涌现。 - 植物登陆：固定风化岩石制造深厚土壤，吞噬二氧化碳重塑气候。 - 脊椎动物演化出四肢尝试陆地生活。 - 石炭纪巨量植物遗骸在地底沉积，化为现代人类所依赖的煤炭资源。 ### [56:43](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3403s) 二叠纪大灭绝、中生代恐龙统治与陨石灾难距今约 2.99 亿年前的二叠纪（Permian），地球上最后一片超大陆——盘古大陆（Pangea）拼接完成。然而仅仅过了数千万年，地球历史上最惨烈的大灭绝事件在二叠纪末期爆发，摧毁了整颗星球绝大多数的物种。面对西伯利亚暗色岩超级火山大喷发带来的惨绝人寰破坏，旁白带有黑色幽默地调侃：“Thanks volcanoes.”（真是多亏了火山呢。）距今约 2.52 亿年前，三叠纪（Triassic）在废墟上拉开序幕，恐龙崭露头角。进入侏罗纪后，地球彻底沦为爬行动物的无上王国，恐龙遍布全球陆地，鸟类的祖先在天空中练习飞行，正如经典名言所言：“Life, uhh, finds a way!”（生命……呃……总能找到出路！）白垩纪晚期，地球各大陆板块轮廓已经与现代极为相似，自然界生机勃勃如同人间天堂。然而灾难突如其来：一颗巨大的小行星猛烈砸向墨西哥尤卡坦半岛，彻底终结了恐龙以及地球上绝大多数物种的统治。 | 地质纪元 | 距今年代 | 核心地质与生物事件 | |:--- |:--- |:--- | | **二叠纪** (*Permian*) | 约 2.99 亿年 | 盘古超大陆形成；末期超级火山爆发诱发地球史上最致命大灭绝。 | | **三叠纪** (*Triassic*) | 约 2.52 亿年 | 大灭绝后生态复苏，第一批恐龙开始登上舞台。 | | **侏罗纪** (*Jurassic*) | 约 2.01 亿年 | 爬行动物全面主宰地球，鸟类祖先出现，恐龙多样化鼎盛。 | | **白垩纪** (*Cretaceous*) | 约 1.45 亿年至 6600 万年 | 植物与恐龙繁盛；末期巨型小行星撞击致恐龙彻底灭绝。 | ### [59:48](https://www.youtube.com/watch?v=S7TUe5w6RHo&t=3588s) 古近纪哺乳动物接棒与人类历史的一瞬恐龙灭绝后，距今约 6600 万年前的古近纪（Paleogene）来临。大陆板块的漂移格局已与现代地球相差无几，失去了大型爬行动物压制的哺乳动物迅速崛起并接管了所有陆地生态位，旁白兴奋地高呼：“It is our time now! We are almost home.”（现在是我们的时代了！我们快到家了。）在长达 1 小时列车之旅的最后几十秒内，旁白急促地向观众发出警示：“Don't blink or you might miss all of human history!”（千万别眨眼，否则你就会错过整个人类历史！）在 45 亿年波澜壮阔的地质长河中，人类的诞生、文明的兴衰与现代社会的建立，仅仅不过是终点前转瞬即逝的一记闪烁。旁白最后总结道：地球如此古老，而我们是如此崭新。在视频尾声，制作团队透露，这部动画是一部倾注心血的诚意之作，自 2019 年起断断续续制作了数年，最终赶在 Kurzgesagt 频道成立十周年之际完成发布。他们以此致敬漫长的时光，并向所有坚持看到最后一刻的观众表达了诚挚的感谢。 - 恐龙退场后，古近纪哺乳动物全面辐射演化接管生态位。 - 人类历史在 45 亿年的时间轴上仅占最后数秒的微小刻度。 - Kurzgesagt 团队自 2019 年开启该项目，历时数年制作，作为十周年特别纪念动画。 ## Mentioned Kurzgesagt – In a Nutshell, Steve Taylor, Epic Mountain, Theia, Bangiomorpha pubescens, Pangea, Gondwana, Columbia, Ur, Nena, Atlantica ## Video description Learn more about how complex life evolved with our new, elaborately detailed Timeline of Evolution Poster. Available only on the kurzgesagt shop here: https://shop.kgs.link/timeline Sources & further reading: https://sites.google.com/view/sources-timeline/startseite?authuser=2 Earth is 4.5 billion years old - which is approximately the same amount of time it took us to create this video. We’ve scaled the complete timeline of our Earth’s life into our first animated movie! Every second shows about a million years of the planet’s evolution. Hop on a musical train ride and experience how long a billion years really is. It’s the perfect background for your next party, a great way to take a break from studying, or a fascinating companion while you’re on the go … and our celebration of 10 years of kurzgesagt. OUR CHANNELS ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ German: https://kgs.link/youtubeDE Spanish: https://kgs.link/youtubeES French: https://kgs.link/youtubeFR Portuguese: https://kgs.link/youtubePT Arabic: https://kgs.link/youtubeAR Hindi: https://kgs.link/youtubeHI Japanese: https://kgs.link/youtubeJA Korean: https://kgs.link/youtubeKO HOW CAN YOU SUPPORT US? ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ This is how we make our living and it would be a pleasure if you support us! Get Products designed with ❤ https://shop-us.kurzgesagt.org Join the Patreon Bird Army 🐧 https://kgs.link/patreon DISCUSSIONS & SOCIAL MEDIA ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ TikTok: https://kgs.link/tiktok Reddit: https://kgs.link/reddit Instagram: https://kgs.link/instagram Twitter: https://kgs.link/twitter Facebook: https://kgs.link/facebook Discord: https://kgs.link/discord Newsletter: https://kgs.link/newsletter OUR VOICE ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ The Kurzgesagt voice is from Steve Taylor: https://kgs.link/youtube-voice OUR MUSIC ♬♪ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ 700+ minutes of Kurzgesagt Soundtracks by Epic Mountain: Spotify: https://kgs.link/music-spotify Soundcloud: https://kgs.link/music-soundcloud Bandcamp: https://kgs.link/music-bandcamp Youtube: https://bit.ly/49vGl2L Facebook: https://kgs.link/music-facebook The Soundtrack of this video: Soundcloud: https://bit.ly/3u6XNdV Bandcamp: https://bit.ly/46bxD7i If you want to help us caption this video, please send subtitles to subtitle@kurzgesagt.org You can find info on what subtitle files work on YouTube here: https://support.google.com/youtube/answer/2734698?hl=en-GB&ref_topic=7296214 Thank you! 🐦🐧🐤 PATREON BIRD ARMY 🐤🐧🐦 ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ Many Thanks to our wonderful Patreons (from http://kgs.link/patreon) who support us every month and made this video possible: robek, Brad Christensen, Asija Newns, Pedro Castro Verdezoto, Lucas Watkins, damien perolle, Fab Cars, alomanola, MikyF2K, Mithilesh Hinge, okor, Lucan, The Gnome, Kyung Geun Kim, Misa Brass, Martin Hippenstiel, Morgan, Anthony Distel, Filip Rogowski, Gabe, Tobias Hofmann, Zaret, Bootools, David Earl, Ben Hamilton, still [Redacted], polyploidy, Elgenzay, Jared, Soda celeste, Felix, Benjamin Goodrich, Taher Rangwala, Jesse Barnes, WillowTree, DarkKot 686, Aaron Phillips, Luc Royal, Lukas Meier, esamoth, Smithius, Mermor, Laura Kühne, Tyler Fendone, gassi30, Andres Arce, Suzanne frounfelter, Akito Nozaki, SirRender, Space, Daniel Hofmeister, Dan M, Jacob Culp, ReyesX77, Aaron T Haltman, DJ Dubbes, SchnarcheNoah, Keira Standing, Steven Lamontagne, Bliss, David Anderson, Uhh Uhhh Uhhh, The Paul Family 0:00 Intro 0:51 Hadean 8:04 Eoarchean 13:20 Paleoarchean 18:35 Mesoarchean 23:51 Neoarchean 27:47 Siderian 30:24 Rhyacian 33:42 Orosirian 36:58 Statherian 39:38 Calymmian 42:15 Ectasian 44:52 Stenian 47:30 Tonian 51:12 Cryogenian 52:18 Ediacaran 53:35 Cambrian 54:17 Ordovician 54:49 Silurian 55:08 Devonian 55:55 Carboniferous 56:43 Permian 57:21 Triassic 58:02 Jurassic 58:46 Cretaceous 59:48 Paleogene 1:00:21 Neogene 1:00:38 Quaternary 1:00:45 Ending [Source](https://www.youtube.com/watch?v=S7TUe5w6RHo)

Source quotes

[60:53] Steve Taylor: Earth is ancient. We are new. So new. [30:27] Steve Taylor: Melting ice flushes toxic elements into the oceans but life quietly puts up resistance and keeps evolving. [27:46] Steve Taylor: Oxygen, burped out by cyanobacteria reaches the atmosphere in large quantities, paving the way for more complex life.

Original transcript

[0:00] Earth is 4.5 billion years old – impossible for your brain to truly grasp, so here is an experiment: [0:08] every second around 1.5 million years will pass – you're on a musical train ride [0:14] looking out the window, passing all of Earth's History in an hour. [0:19] Watch the eons pass and experience how long a billion years really is. [0:25] You can have this in the background, study with it or just enjoy the ride. [0:30] From time to time, I’ll say a few words. [0:33] 4.5 billion years ago, right after it was born, Earth was a hell of lava… [0:41] Pretty early in its history, Earth collides with a Mars sized object called Theia, [0:47] which forms the moon that you now see in the sky. [0:53] Right now it looks huge in the night sky and will slowly shrink over hundreds of millions [0:59] of years as it orbits further away. [1:06] 4.5 Billion Years Ago we are in the first eon of our planet, the Hadean, named after the greek god of the underworld. [1:32] At this point the Atmosphere is mostly CO2 and the floor is lava. [1:39] This area of earth's history is mostly invisible to us because almost none of it is left. [2:06] 90 million years have passed. [2:08] We are still in the lava hell phase. [2:11] Settle in, this will take a while. [2:47] Although you wouldn't think it, we found minerals called zircons that indicate [2:52] there may have been some water around at this time. [6:48] During this period of the young solar system, Earth and the inner solar system are smashed [6:53] by a constant heavy asteroid bombardment, for several hundred million years. [7:12] At this point in time, our Sun is 30% less bright than it is today but there are so many [7:19] greenhouse gases that it's still much hot and comfy. [8:16] Around this time we think life begins to enter the stage. [8:21] Only a few hundred million years after the beginning of everything the first cells begin [8:27] spreading over our still very deadly planet. [8:37] Earth continues to cool and it probably rains for millions of years [8:42] as our oceans begin to form, covering the still young planet with water. [12:43] These hydrothermal vents we're looking at, and where hot minerals emerge, may have been [12:49] the place where life first developed, but we dont know. [13:18] So much time has passed and we are entering the Paleoarchean. [13:23] Most of Earth is still underwater while the first supercontinents are in the making [13:29] in the depths below. [13:31] Its days are shorter since the young Earth spins faster. [13:42] Good job if you are still watching. [13:45] You witnessed a billion years so far. [17:50] From this time in history we still have Stromatolites, sedimentary rocks built by microorganisms. [17:56] Among our first real evidence of life on Earth. [18:00] Also life is starting to eat the sun – photosynthesis might have started as early as around here. [18:35] 3.2 Billion Years Ago in the Mesoarchean the era of continents begins. [18:42] Tectonic plates begin to crush into each other, pulling and pushing some deep into the earth [18:48] where they dissolve. [18:50] The basis for our continents today. [18:54] The oceans are as hot as a hottub, over 40°C and microbes are expanding everywhere. [19:03] We don't have plants yet to consume greenhouse gases, so it is really, really hot. [19:10] You would basically die immediately in this atmosphere. [19:14] Also there is no oxygen in the atmosphere yet. [23:51] 2.8 Billion Years Ago the Neoarchean begins. [23:55] Earth is still a terribly hostile place but because we finally have proper plate tectonics, [24:02] more chemicals are mixed in from inside the earth and life can use them to make new things! [24:34] Some time around here Prokaryotes like bacteria begin colonizing the planet. [24:40] Life diversifies more and more. [24:43] But still, after so much time, we only have single cells. [27:46] 2.5 Billion Years Ago in the Siderian, a massive event is about to begin [27:52] that will change the planet forever: The Great Oxidation Event. [27:57] Oxygen, burped out by cyanobacteria reaches the atmosphere in large quantities, [28:03] paving the way for more complex life. [29:39] All the new oxygen in the air reacts with methane and forms CO2 and Water, [29:44] which rapidly cools the planet down. [30:16] Probably for the first time ever, the planet freezes over and a period of multiple [30:21] ice ages begins lasting millions of years. [30:27] 2.3 Billion Years Ago the Rhyacian begins. [31:14] Lots of volcanos heat up earth and earth unfreezes slowly again. [31:20] Melting ice flushes toxic elements into the oceans but life quietly puts up resistance [31:27] and keeps evolving. [33:48] Some time 2.05 Billion Years Ago in the Orosirian a large asteroid hits earth and creates the [33:56] largest verified impact structure on Earth. [34:47] All over Earth great mountain ranges are crushed into existence by early continents [34:52] with wild names like Ur, Nena or Atlantica. [37:00] 1.8 Billion Years Ago in the Statherian the supercontinent Columbia has formed. [37:06] And a natural, self sustaining nuclear reactor awakes, [37:11] just from scattered uranium deposits in the ground. [39:37] 1.6 billion years ago, around the edge of Calimmian, + or - a few hundred million years or so, [39:44] the first Eukaryotic cells, cells with a nucleus, merge from two other cells. [39:50] One of the most important moments in the history of life. [39:54] But yes, kind of looks not that impressive. [39:59] Still, life is only cells. [41:35] Earth's crust thickens and heavy continents form, the oceans become shallower. [41:42] Also the first fungi-like organisms extent their tubular arms and do fungi things. [42:17] Some time in the Ectasian 1.4 Billion Years Ago, Earths inner core is forming. [42:24] Weird, right? Feels like it should be older. [42:27] But around here it begins to solidify into a iron crystal surrounded by hot liquid metal. [42:34] It will only grow from now on. [44:53] 1.2 Billion Years Ago in the Stenian not that much is going on. [44:59] Except, the algae Bangiomorpha pubescens might have invented sex. [45:05] A big reproductive improvement for many different reasons. [47:33] 1 Billion Years Ago the Tonian begins, another age where Earth is rocks and puddles and oceans. [47:42] Life is still invisible to the naked eye. [47:45] It does feel different to witness it like that, right? [50:07] Not everybody is having a great time here. [50:11] We have evidence of the first unicellular predators emerging around that time. [50:16] The dominance of bacteria ends and big boy eukaryotes plant their flags in the oceans. [50:21] An arms race between microbes begins that again creates huge diversity. [50:29] Some even invent tiny armour. [51:14] 720 Million Years Ago in the Cryogenian Earth freezes over again. [51:21] Sure why not. [51:23] How did life survive? [51:25] We are not sure. [52:19] 635 Million Years Ago the supercontinent Gondwana forms. [52:24] A lot of it is still left today! [53:15] Wow! What's happening? [53:17] Suddenly life gets big! [53:19] In a hot second multicellular organisms become widespread! [53:24] It's all strange aliens still, but can you imagine that it took that long for this to happen? [53:35] 539 Million Years Ago the Cambrian explosion begins. [53:40] We see life bursting with variety. [53:43] Ancestors of almost all of today's major animal groups appear here while the plants start [53:49] to discover the land. [53:51] Life is finally exciting! [53:54] But of course a big mass extinction happens right after, killing most species in the ocean. [55:01] Plants spread over the planet and create the soil on the ground and change the atmosphere [55:07] by eating CO2. [55:38] Things escalate. [55:40] Flora and fauna adapt better and better to life on land. [55:45] We get trees and forrests, fish and the first vertebrate decide this land thing [55:51] is something they need to try out! [55:56] 359 Million Years Ago in the Carboniferous forests and lush marshlands are at their peak. [56:05] They will turn into the coal humanity burns today to keep ourselves warm. [56:12] Its all so fast now! [56:14] Life changes so quickly in geological timeframes! [56:42] Some 299 Million Years Ago in the Permian, Pangea, the last supercontinent has formed. [56:50] And after a few tens of million years, the largest mass extinction in history happens, [56:56] killing the majority of all species. [56:58] Thanks volcanoes. [57:23] 252 Million Years Ago the Triassic begins. [57:41] Oh hey, a dinosaur! [58:02] We are now truly in the age of reptiles. [58:05] Dinosaurs are everywhere! [58:08] The ancestors of the birds do bird things. [58:13] Life, uhh, finds a way! [59:20] Earth gets more and more familiar. [59:38] Such a paradise. [59:40] Life is thriving. [59:43] Nothing can go wrong... wait, what's that? [59:50] And an asteroid killed the dinosaurs and most species on Earth. [59:54] Such a bummer. [59:57] 66 Million Years Ago in the Paleogene [60:00] the continents look roughly the same as today and mammals take over. [60:06] It is our time now! [60:09] We are almost home. [60:39] Don't blink or you might miss all of human history! [60:45] And that was it. [60:47] Earth is ancient. [60:49] We are new. [60:51] So new. [60:53] This was a project born of passion. [60:55] We've worked on this video on and off since 2019 and as you can imagine, it took forever to make. [61:01] But we did we finished it in time for our tenth10 year anniversary. [61:04] If you want to support experimental videos like this one please like, share and subscribe [61:09] and press the bell. [61:10] You can also continue your journey through time with our new Timeline of Evolution poster. [61:15] Discover how long it took for the first cellular blobs to evolve into fishes, then into dinosaurs, [61:19] and finally into mammals – and encounter amazing creatures you've never heard of along the way. [61:24] This poster is part of our Education Edition. [61:27] A poster series that brings complex topics to life through extensive research and [61:31] elaborate illustrations. [61:32] It’s perfect for teachers, students, and science lovers. [61:36] Get them from our shop and support what we do on this channel. [61:38] In any case, if you got this far, thank you so much! [61:42] Hope you felt something watching this.