The study of stellar spectra reveals that most of the stars consist of 71% hydro

Question

The study of stellar spectra reveals that most of the stars consist of 71% hydrogen, 27% helium and 2% of all other elements. Given the relatively uniform composition of stars, which of the following could produce observable differences in the spectra?
A. The surface temperature of the star
B. The recession/approach speed of the star
C. The density of the star’s atmosphere
D. All of the choices are correct.
E. Only the surface temperature of the star and the density of the star’s atmosphere are correct.

Explanation / Answer

Answer is option-A) The surface temperature of the star

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