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Unit 2 Lesson 1 & 2
Vocabulary Terms
Term | Definition |
---|---|
Solar system | The sun and all the plants and other bodies that travel around it |
Galaxy | A collection of stars,gust,and gas bound together by gravity |
Planet | A relatively large spherical that orbits a star |
Light year | the distance that light travels in one year; about 9.46 trillion meters |
Star | A large celestial body that is composed of gas and that emits light; the sun is a typical star |
Universe | Space and all the matter and energy in it |
Luminosity | The actual brightness of an object such as a star |
Apparent magnitude | 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 |