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Universe
Term | Definition |
---|---|
Universe | Space and all the matter and energy in it. |
Light-Year | The distant that 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 obits a star. |
Star | A large celestial body that is composed of gas and that emits light; The sun is a typical star. |
Astronomical-Unit | A large distance between Earth and sun; Approximately 150 million kilometers symbol,AU |