Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?
A) spectral type M2, luminosity class I
B) spectral type O9, luminosity class I
C) spectral type M1, luminosity class V
D) spectral type G2, luminosity class V
Correct Answer:
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Q50: A star's luminosity is the
A)total amount of
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