Sciences · Research

Astrophysics

The physics of stars, galaxies, and the cosmos — understanding the universe at the largest scales.

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Books
Book

Cosmos — Carl Sagan

The book and series that made astrophysics feel like philosophy. Still the best gateway into the subject.

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People
Person

Carl Sagan

The cosmologist, science communicator, and author whose Cosmos series and writing (Pale Blue Dot, The Demon-Haunted World) shaped how a generation understood our place in the universe. Science infused with awe, advocacy for reason delivered with poetry.

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Tools & media
Media

NASA Astronomy Picture of the Day

A new image of the cosmos every day with an expert explanation. One of the internet's oldest and best daily rituals.

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arXiv astrophysics

Preprint papers from the cutting edge of astrophysics — free, immediate, unfiltered.

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We are made of star-stuff. We are a way for the cosmos to know itself. — Carl Sagan — Cosmos