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Brightness is a value of luminosity verses distance as viewed from a point.

From Earth, the luminosity of a star is it's apparent magnitude, whereas absolute magnitude is it luminosity as viewed from a set point (for stars this value is about 32 light years).

Because of this a star can loose temperature but gain in diameter and appear brighter, in contrast a star can contract and thus shrink, but heat up and appear brighter.

Brightness is related to temperature, not the other way around.

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Gillian Watsica

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3y ago

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