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

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

(1) temperature 

(2) pressure 

(3) density 

(4) radiation from them 


Answer: (1). 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 black bodies and that the colour variation of stars is a direct consequence of their surface temperatures. 

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


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