The color of a star depends on its (composition, distance, temperature), (red, white, yellow ) and -colored stars are the coolest.

The color of a star depends on its Temperature.

Red-colored stars are the coolest.

Explanation:

Color of a star depends on its temperature. We can understand this from Wein's displacement law. The peak wavelength emitted by a star is inversely proportional to the surface temperature of the star.

Higher the temperature, smaller is its wavelength.

Blue colored stars are the hottest. On the other hand cool stars have long wavelengths and hence are red in color.

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sodium is solid at rt