astronomy

astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large.

Sections in this article:

• Introduction
• Modern Techniques, Discoveries, and Theories
• Astrophysical Discoveries
• Galileo's Telescope
• Brahe and Kepler
• The Copernican Revolution
• The Alexandrian School and the Ptolemaic System
• Greek Innovations
• Ancient Astronomy
• Bibliography

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