what information does the color of a star tell you?
Spectral classes give us a convenient way to refer to most types of stars - from O0, the hottest at over 25,000Â° K, down to T9, the coolest failed stars at 1,000Â° K. Each spectral type of star is associated with a specific color: G-type stars like the sun are yellow, M-type stars appear red, and B-type stars are bluish.