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Some new stars are brighter than older stars, since it's at that period that the star begins to shrink. But as the star grows older, it will become a red giant and become larger and brighter. Finally, it is at it's brightest when it explodes in a supernova. For brown dwarfs, though, there is a violent first million years and then an uneventful and faint couple billion years. For big stars, there are eruptions at the surface very often, which gives them a very bright life of a couple million years.

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