Astronomy is a natural science. It is the study of everything outside the atmosphere of Earth.
It studies celestial objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae) and processes (such as supernovae explosions, gamma ray bursts, and cosmic microwave background radiation). This includes the physics, chemistry of those objects and processes.
A related subject, physical cosmology, is concerned with studying the Universe as a whole, and the way the universe changed over time.
The word astronomy comes from the Greek words astron which means star and nomos which means law.A person who studies astronomy is called an astronomer.
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- Solar System
Weight on Other Planets