4.5 Billion Years in 1 Hour

Earth, 4.5 billion years ago, was a molten hellscape. Soon after its formation, a collision with a Mars-sized object named Theia created the Moon, which initially appeared much larger in the night sky and will slowly recede over millions of years.

The Hadean eon, named after the Greek god of the underworld, was characterized by an atmosphere primarily composed of CO2 and a surface of lava. Despite the extreme conditions, faint evidence suggests the presence of water. This period also saw a constant, heavy asteroid bombardment of the inner solar system.

Remarkably, only a few hundred million years after Earth's formation, life began to emerge, with the first cells spreading across the still deadly planet. As Earth cooled, millions of years of rain led to the formation of oceans, covering the young planet. Hydrothermal vents are theorized as potential cradles for early life.

Entering the Paleoarchean, most of Earth remained underwater as the first supercontinents began forming beneath the depths. Stromatolites, sedimentary rocks built by microorganisms, provide some of the earliest evidence of life, indicating that photosynthesis may have already begun.

The Mesoarchean marked the beginning of continents as tectonic plates started their relentless movement, creating the foundations for modern landmasses. Oceans were incredibly hot, exceeding 40°C, and microbes flourished in an atmosphere devoid of oxygen and extremely hot due to abundant greenhouse gases.

While still hostile, the Neoarchean saw the establishment of proper plate tectonics, leading to a richer chemical environment. This allowed life, specifically prokaryotes like bacteria, to colonize the planet and diversify, though life remained unicellular.

In the Siderian, the Great Oxidation Event began as cyanobacteria released vast amounts of oxygen into the atmosphere, changing the planet forever. This new oxygen reacted with methane, forming CO2 and water, which caused a rapid cooling and ushered in Earth's first periods of ice ages in the Rhyacian.

The Orosirian saw a massive asteroid impact, creating the largest verified impact structure. By the Statherian, the supercontinent Columbia had formed, and a natural, self-sustaining nuclear reactor was even active from scattered uranium deposits.

The Calymmian around 1.6 billion years ago witnessed one of the most pivotal moments in the history of life: the emergence of the first Eukaryotic cells, cells with a nucleus, formed from the merging of two other cells. Life, however, remained exclusively cellular.

The Ectasian saw the formation of Earth's inner core, which began solidifying into an iron crystal. In the Stenian, algae like Bangiomorpha pubescens are believed to have 'invented' sexual reproduction, a significant reproductive advancement.

The Tonian, another eon of rocks and oceans, saw the emergence of the first unicellular predators. This marked the end of bacterial dominance and initiated an 'arms race' among microbes, leading to huge diversity and even the development of tiny armour.

In the Cryogenian, Earth experienced another significant freezing event. Despite this, life continued to evolve. Towards the end of this period, the supercontinent Gondwana began to form, much of which still exists today.

A dramatic shift occurred around 539 million years ago with the Cambrian explosion, where multicellular organisms became widespread and life burst with variety. Ancestors of almost all modern animal groups appeared, and plants began to colonize land. This period was followed by a major mass extinction.

Plants spread across the planet, creating soil and altering the atmosphere by consuming CO2. Flora and fauna adapted to land, leading to trees, forests, and the first vertebrates. The Carboniferous saw peak forests and marshlands that would later form coal deposits. The Permian, with the supercontinent Pangea, ended with the largest mass extinction in history, largely due to volcanic activity.

The Triassic ushered in the age of reptiles, dominated by dinosaurs that were ubiquitous across the planet. The ancestors of birds also began to emerge, and life continued to find a way, thriving in this new era.

A catastrophic asteroid impact brought an end to the dinosaurs and most species on Earth. This event, 66 million years ago in the Paleogene, cleared the way for mammals to take over, leading to the continents resembling their modern forms.

Human history, in the grand scheme of Earth's 4.5 billion years, is but a fleeting moment. This video, a passion project, condenses this immense timescale, highlighting how ancient our planet is and how new humanity truly is.