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The Universe
Term | Definition | picture |
---|---|---|
Revolution | the motion of a body that travels around another body in space one complete trip along an orbit. | |
Rotation | the spin of a body on its axis | |
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. | |
Planet | a relatively large spherical body that orbits a star. | |
Light year | the distance that light travels in one year about 9.46 trillion kilometers. | |
Star | a large celestial body that is composed of gas that emits light the sun is a typical star. | |
Universe | space and all the matter and energy in it. | |
astronomical Unit | The average distance between earth and the sun approximately 150 million kilometers symbol. |