The archive

Explore the cosmos.

From the smallest worlds to the largest structures in the universe, there is always more to understand.

Begin the descent

The largest view

Where does it begin? How does it expand? And how does it end? Cosmology treats the universe as a single object — one with a history we can measure, model, and slowly understand. Begin with the widest view there is.

Read about cosmology

Cosmology

Beginnings, expansions, possible endings — the universe's whole life story, told from the inside.

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The subjects

Twelve doors into the universe. Each leads somewhere larger than the room it opens from.

AstronomyThe oldest science. Learning to read the sky — its motions, its measure, and its quiet regularity.
AstrophysicsThe physics of everything above the atmosphere: how stars shine, how matter falls, how the elements form.
CosmologyThe universe as a single object — its beginning, its expansion, and its eventual fate.
The Solar SystemOne star, eight worlds, and the leftover pieces of a formation that has not quite finished.
PlanetsWorlds enough to lose count of. How they form, migrate, and sometimes collide.
ExoplanetsEvery star a possible sun. Five thousand known worlds and a method for finding the rest.
StarsFurnaces with lifetimes. Born in collapse, sustained by fusion, ending in fire or silence.
GalaxiesIslands of stars bound by dark matter, a hundred billion of them, drifting apart.
Black holesWhere geometry wins. Regions of spacetime that bend light, swallow gas, and slow time.
Neutron starsA city-sized remnant spinning hundreds of times a second, with a magnetic field to match.
AstrophotographyThe craft of collecting photons that left their stars before photography was invented.
Space explorationMachines we send ahead of us — orbiters, landers, telescopes, and the occasional human.

There's always more to discover.

The archive grows with the community that reads it. Add your curiosity to ours.

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