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Why does a star need to be so hot in order to become a star?

User SHT
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Answer:

The temperature needed for hydrodgen burning is 10 million Kelvin, so that's how hot a star must be to be considered as a star. It needs to get so hot, because else it will fail to burn hydrodgen and will become a "failed star": a brown dwarf.

That increased surface area allows more light and energy to be given off. Temperature also affects a star's luminosity. ... As a star gets hotter, the number of nuclear reactions increases. More reactions, more energy.

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