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| a unit of measurement repesenting the distance that light travels in one year. |
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| the measure of a stars brightness, based on the amount of light it actually gives off |
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| The measure of a star's brightness as seen from earth. |
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| an natural object that revolves around a planet |
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| the gases that surrounds a planet held by gravity |
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| a natural or human-built object that revolves around another object in space |
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| an object in space that resembles earth in size, density, and rocky composition |
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