Chapter I • 13.8 Billion Years

Cosmic Origins

From the Big Bang to the birth of Earth — the 13.8-billion-year story of how the universe became capable of life, consciousness, and wonder.

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9 Milestones
13.8 Billion Years
Original Videos
13.8 billion years of cosmic time
First stars & galaxies
Scientifically accurate reconstructions
Fully illustrated & self-contained
PRIMORDIAL

The Big Bang

The instant space, time, and all matter came into existence.
PRIMORDIAL

First Stars & Galaxies

The cosmic dawn when the first stars ignited in the darkness.
GALACTIC

Milky Way Formation

Our home galaxy takes its majestic spiral form.
SOLAR SYSTEM

Solar System Birth

A collapsing cloud gives birth to our Sun and planets.
EARLY EARTH

Hadean Earth

A molten, hellish world of constant impacts and lava oceans.
EARLY EARTH

Theia Impact & The Moon

A cataclysmic collision that gave Earth its companion.
EARLY EARTH

Late Heavy Bombardment

The final intense rain of asteroids that shaped the young Earth.
EARLY EARTH

Archean Earth

The planet cools and the first oceans and life appear.
GAIA HYPOTHESIS

The Gaia Hypothesis

Earth as a single, self-regulating living system — the central idea of this Odyssey.
THE FOUNDATION OF EVERYTHING

Why Cosmic Origins Matter

We are made of stars

Every atom of oxygen in your lungs, carbon in your cells, and iron in your blood was forged in the cores of ancient stars or in the fires of the Big Bang itself. The universe's first chapters are literally written in our bodies.

The solar system was violent

Earth did not form peacefully. It was bombarded by asteroids, collided with a planet-sized body called Theia (creating the Moon), and endured the Late Heavy Bombardment. These catastrophes delivered water and shaped the only world we know that harbors life.

Deep time connects everything

The same physical laws that governed the expansion after the Big Bang govern the chemistry of life today. Understanding cosmic origins reveals why Earth was not just possible — it was inevitable.

Frequently Asked Questions

How long ago was the Big Bang? ↓

Scientists estimate the Big Bang occurred approximately 13.8 billion years ago. This marks the beginning of the universe as we understand it, when space, time, matter, and energy came into existence from a single point.

What was the Theia impact? ↓

The Theia impact was a colossal collision between early Earth and a Mars-sized planet called Theia. This event is believed to have created the Moon and dramatically reshaped our planet's mantle and crust.

When did the first stars form? ↓

The first stars are thought to have ignited a few hundred million years after the Big Bang. They ended the cosmic dark ages and began forging the heavier elements that would later build planets and life.

CHAPTER II AWAITS

The story continues with the origin of life itself.

Four billion years ago, chemistry became biology. The next chapter of the Gaia Odyssey begins in the oceans of the young Earth.

Continue to The Living Earth → Skip to the Dinosaur Age