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the universe vocab
Term | Definition |
---|---|
Universe | space and all the matter and energy in it |
Light-year | the distance that light travels in one year |
solar system | The Sun and all of the planets and other bodies that travel around |
galaxy | A collection of stars,dust,and gas bound together by gravity |
Planet | A relatively Large spherical body that orbits a star |
Star | A large celestial body that is composed of gas and that emits light |
Astronomical unit | The average distance between Earth and the sun |