astrophysics

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astrophysics Branch of astronomy that studies the physical and chemical nature of celestial bodies and their evolution. Many branches of physics, including nuclear physics, plasma physics, relativity, and spectroscopy, are used to predict properties of stars, planets, and other celestial bodies. Astrophysicists also interpret the information obtained from astronomical studies of the electromagnetic spectrum, including light, X-rays, and radio waves.

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astrophysics

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