A) Distance from the earth
B) Distance from the sun
C) Temperature
D) Luminosity
Correct Answer: C
Solution :
The colour of the star is an indication of its temperature. The glowing is caused by something called Black-Body radiation, which has to do with the heat energy trying to radiate away in more and more energetic wavelengths. Red stars are relatively cool at only a few thousand degrees Celsius, white stars are hot at about ten thousand degrees, and blue stars are the hottest.
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