While camping, I noticed that if you look long enough at almost any star, you start seeing some tiny, subtle colors in that star. Even crazier, they sometimes flicker between more colors. In my case orange, blue and something like cyan.
Besides constellations, what else could you observe regarding starts, with the naked eye?
Most of the more exotic colors (such as green) are caused by various optical tricks.
Physically speaking, all true stars are roughly one of these colors:
The exact color of a star depends on its size/temperature. Red stars are the coolest, while blue stars are the hottest.
There are in fact no green stars at all. At least not to human eyes. Very cool and interesting stuff.
https://www.sciencefocus.com/space/why-arent-there-any-green-stars
So not only are we the goldilocks of planet position in the solar system, we are also the goldilocks of star temperature?
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Are most of those colors present in the visible sky?
Most of them, yes. The reddest stars (like Proxima Centauri) are too cool and dim to be visible to the naked eye, but if you go somewhere with no light pollution and let your eyes adjust you should be able to perceive some differences between stars.