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Solar System Unit

The solar system

Galaxy A system of billions of stars and other matter held relatively close to each other by gravity and separated from other such systems by vast distances.
Orbit The curved path in which a planet, satellite, or spacecraft revolves about another body.
Planet A large, non luminous celestial body, that revolves around a star and often has one or more satellites.
Satellite A heavenly body that revolves around a planet or other large body.
Constellation Any of eighty-eight groupings or patterns of stars named after animals, objects, or mythological characters they are though to resemble.
The Big Bang Theory The universe originated billions of years ago in an explosion from a single point of nearly infinite energy density — compare steady state theory
Atmosphere A layer of gases surrounding a planet, star, or moon.
Gravity The force that pulls all objects toward each other. Without it we would float away!
Created by: kelleyumlauf