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This is the color of something infinitely hot. Of course you'd instantly be fried by gamma rays of arbitrarily high frequency, but still. This is also the color of a typical neutron star. They're so hot they look the same. This was worked out by @gro_tsen. (1/n)pic.twitter.com/x4G9ozgVP3
As a blackbody gets hotter and hotter, its spectrum approaches the classical "Rayleigh-Jeans law". That is, its true spectrum as predicted by quantum mechanics - the "Planck law" - approaches the classical prediction over a larger and larger range of frequencies. (2/n)pic.twitter.com/d01wncRmHJ