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Universe
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Term | Definition |
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Universe | Space and all the matter and energy in it.... |
Light-year | The distance that light travels in one year; about 9.46 trillion kilometers. |
Solar System | The sun and all of the planets and other bodies that travel around it. |
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; approximately 150 million kilometers symbol, AU. |