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Posted by on Monday, May 25, 2009 at 6:17am.

Which is hotter - a red star or a blue star? Why?

I know it's the blue star, but I don't know why...

  • Science - , Monday, May 25, 2009 at 9:27am

    The radiation emitted by a star is to a good approximation thermal radiation. This then implies that the spectrum will be the Planck spectrum. The higher the temperature, the shorter the wavelength at which the emitted power will peak.

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