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Color from a "black box" (i.e., a ball of gas with no intrinsic color) is a function of it's temperature. Much like heating a piece of steel in a fire - first it glows red, then yellow, then white,...
Basically a red dwarf just gets cooler and cooler until it has consumed all of it's hydrogen. It will then dissipate any remaining heat into space and become a black dwarf.
A red dwarf can last for a trillion years, or for several trillion years, before it runs out of energy (and turns into a white dwarf). That is much longer than the current age of the Universe. In...
Red Mass is a Catholic service in honor of the legal profession. The name comes from the Red gowns of the High Court Judges that attend. The observance began in England, France and Spain as early as...