Two stars are observed with a spectrograph and one is classified as
spectral type A, and the other as spectral type M. What can we infer about these two stars.
Select one or more:
A. The A star is hotter than the M star B. The A star is more luminous than the M star C. The M star is hotter than the A star D. The M star has a redder colour than the A star
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