Q.

The different colours of different stars are due to the variation of –

A. temperature
B. pressure
C. density
D. radiation from them
Answer» A. temperature
Explanation: Shortly after blackbody radiation was understood, it was noticed that the spectra of stars look extremely similar to blackbody radiation curves of various temperatures, ranging from a few thousand Kelvin to ~50,000 Kelvin. The obvious conclusion is that stars are similar to blackbodies, and that the colour variation of stars is a direct consequence of their surface temperatures.
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