#Physicsfactlet (106)
Cold stars look red. Hot stars look blue. But there is no green star.
To be more precise: stars emit a very broad and temperature-dependent spectrum, so intermediate temperature stars excite in roughly equal measure all 3 of the color receptors in our eyes.

For the sake of the animation I approximated the emission of a star with a black body spectrum. Spectrum to perceived color mapping is a bit approximate, but should give the right idea. Thanks to @timdweber for hearing my cry for help about color matching functions.

If you are wondering how an animal with more color receptors than us (e.g. a Mantis Shrimp with its ~15 color receptors) you better ask @MeinzerNina