13.8 Billion Years of Cosmic History
From the first spark of the Big Bang to today's space telescopes — explore every milestone in the story of our universe on one continuous timeline.
Logarithmic scale — all eras are visible with proportional spacing
The Beginning
13.8 – 13 billion years ago
Big Bang
The universe begins as an infinitely dense singularity, exploding outward in the most energetic event in all of history.
Inflation
The universe expands exponentially in a fraction of a second, growing from subatomic to cosmic scale almost instantly.
First Stars Form
The "cosmic dawn" ends the dark ages as hydrogen and helium collapse into the first luminous stars.
First Galaxies Form
Gravity pulls stars together into the earliest galaxies — small, irregular collections of young, hot stars.
Cosmic Evolution
13 – 5 billion years ago
Milky Way Begins Forming
Our home galaxy starts as a small collection of stars and gas, gradually growing through mergers and accretion.
Heavy Elements Forged in Supernovae
Massive stars explode as supernovae, scattering carbon, oxygen, iron, and other heavy elements that will enable rocky planets.
Milky Way's Disk Takes Shape
Our galaxy settles into its iconic spiral disk structure with well-defined arms of stars, gas, and dust.
Our Solar System
5 – 3.5 billion years ago
Solar System Forms
A cloud of gas and dust collapses under gravity, igniting our Sun and forming a swirling disk of material that becomes the planets.
Earth Forms, Moon Created
Earth coalesces from rocky debris. A Mars-sized body slams into early Earth, ejecting material that becomes our Moon.
Late Heavy Bombardment
A barrage of asteroids pummels the inner planets, cratering surfaces and delivering water and organic molecules to Earth.
First Life on Earth
Single-celled organisms appear in Earth's oceans — the first known life, likely near hydrothermal vents on the ocean floor.
Life Evolves
3.5 BYA – 10,000 years ago
Great Oxygenation Event
Cyanobacteria flood the atmosphere with oxygen, transforming Earth's chemistry and enabling complex aerobic life.
Cambrian Explosion
Complex multicellular life appears in an extraordinary burst of evolution — most major animal groups emerge in a geological instant.
First Dinosaurs
Small, bipedal reptiles in the Triassic period mark the beginning of the dinosaur lineage that will dominate for 165 million years.
Asteroid Kills Dinosaurs
A 10-km asteroid strikes the Yucatan Peninsula, triggering mass extinction. 75% of species vanish, clearing the way for mammals.
Homo Sapiens Appear
Modern humans emerge in Africa, eventually spreading across every continent and fundamentally transforming the planet.
First Civilizations & Astronomy
Mesopotamia and Egypt develop writing, mathematics, and systematic astronomy — humanity begins mapping the cosmos.
Space Age
1957 – present
Sputnik — First Satellite
The Soviet Union launches Sputnik 1, a beeping metal sphere that becomes the first artificial object to orbit Earth.
Yuri Gagarin — First Human in Space
Soviet cosmonaut Yuri Gagarin completes one orbit of Earth aboard Vostok 1, proving humans can survive in space.
Apollo 11 — First Humans on the Moon
Neil Armstrong and Buzz Aldrin walk on the lunar surface. "That's one small step for man, one giant leap for mankind."
First Space Station (Salyut 1)
The Soviet Union launches the first crewed orbital station, pioneering long-duration spaceflight.
Voyager 1 & 2 Launched
NASA's twin probes embark on a grand tour of the outer planets, carrying golden records with sounds and images of Earth.
First Space Shuttle Flight
Columbia launches, inaugurating the Space Shuttle era — the first reusable crewed spacecraft.
Hubble Space Telescope
Hubble launches into orbit, eventually delivering some of the most iconic and scientifically important images of the cosmos.
ISS Construction Begins
The first modules of the International Space Station launch, beginning assembly of humanity's largest structure in orbit.
Mars Rovers Spirit & Opportunity
NASA lands twin rovers on Mars. Opportunity operates for 15 years, far exceeding its 90-day mission.
Voyager 1 Enters Interstellar Space
After 35 years, Voyager 1 crosses the heliopause and becomes the first human-made object to reach interstellar space.
James Webb Space Telescope
JWST launches on Christmas Day, carrying the most powerful space telescope ever built to peer back at the universe's first light.
Artemis Program — Return to the Moon
NASA's Artemis program begins the next chapter of lunar exploration, aiming to establish a sustained human presence on the Moon.
You Are Here
June 25, 2026 — 13.8 billion years after it all began
If the universe's history were a 24-hour day, all of human civilization would fit in the last 0.2 seconds.