Go outside on a dark, moonless night. Look up. Is it December or January? Check out Betelgeuse, glowing dully red at Orion’s shoulder, and Rigel, a laser blue at his knee. A month later, yellow Capella rides high in Auriga.
Is it July? Find Vega, a sapphire in Lyra, or Antares, the orange-red heart of Scorpius.
In fact, any time of the year you can find colors in the sky. Most stars look white, but the brightest ones show color. Red, orange, yellow, blue… almost all the colors of the rainbow. But hey, wait a sec. Where are the green stars? Shouldn’t we see them?
Nope. It’s a very common question, but in fact we don’t see any green stars at all. Here’s why….