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Unit 2 lesson 1+2
Term | Definition |
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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. |
Light year | The distance that light travels in one yea; about 9.46 trillon kilometers. |
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 | Absolute magnitude is a measure of how bright a star would be if it were seem from a standard distance |