unit 2 lesson 1,2 Word Scramble
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| Term | Definition |
| Solar system | The sun and all of the planet 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 star. |
| Light Year | The distance that light travels in one year about 9.46 trillions kilometers. |
| Star | A large celestial body that is composed of gas and the emits light the sun is a typical star. |
| Universe | Space and all the matter and energy in it. |
| Luminosity | The actual brightness of and object such as a star. |
| Apparent Manitude | The brightness of a star as seen from earth. |
| Absolute Magnitude | A measure of how bright a star would be if it were seen from a standard distance. |
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