#PhysicsFactlet
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.
There are green galaxies, but that is a story for another time 😉
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@j_bertolotti beautiful post... Can this "another time" be soon? :)
@j_bertolotti thank you so much, I had not realized that was something I should have been surprised about :)
@scruffy Not sure when I will have the mental space for it, but in the meanwhile this short article by Ethan Siegel (don't know if he is on Mastodon) explains it well and with a ton of pretty pictures!
https://www.forbes.com/sites/startswithabang/2021/01/04/there-are-no-green-stars-but-green-galaxies-are-real