Multiple Choice
An astronomer is observing a star which puzzles her. The lines in the star's spectrum indicates that the star is very hot and should therefore be blue. But the star looks reddish in photographs and in measurements of the continuous spectrum. What is one possible explanation of this puzzle?
A) this star is surrounded by an HII region
B) this star is in a local bubble, just like the Sun
C) the star is no longer undergoing nuclear fusion inside
D) we are seeing the light of the star through layers of interstellar dust
E) this star must be located high above the disk of the Milky Way Galaxy
Correct Answer:
Verified
Correct Answer:
Verified
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