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The Universe
Term | Definition |
---|---|
Univers | space and all matter and energy in it. |
light year | the distance that light travels in one year; about 4.46 trillion k. |
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; the sun is a typical star |
astronomical unit | the average distance between earth and the sun. |
solar system | the sun and all of the planets travel around it. |