Which spectral classification signifies the coolest stellar surface temperature?
A) B
B) K
C) G
D) A

Question

Quizplus · Accepted Answer

The spectral classification system is based on the temperature of a star's surface, with the hottest being O and the coolest being M. The sequence is O, B, A, F, G, K, and M. Therefore, the spectral classification that signifies the coolest stellar surface temperature is M, and B is the closest option given in the choices.

Which Spectral Classification Signifies the Coolest Stellar Surface Temperature