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Solar System Unit
The solar system
Term | Definition |
---|---|
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! |