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Astronomy

The universe at every scale — planets, stars, galaxies, and time itself.

Astronomy is the study of everything beyond Earth: planetary systems, the life and death of stars, galaxies, black holes, and the origin and fate of the universe. Built on physics and mathematics, it turns careful observation into some of the deepest answers we have about where everything comes from.

Coming to Astronomy

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  • Quizzes
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Part of 86 subjects, 1,300+ courses, and 36,000+ video lectures. All free.

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