Multiple Choice
Galactic disks appear blue because
A) dark matter gravitationally shifts all wavelengths towards the blue.
B) O and B blue giants are much brighter than G, K, or M dwarfs.
C) they contain only blue reflection nebulae.
D) dust obscures the longer, red, wavelengths.
E) they contain no G, K, or M dwarfs.
Correct Answer:
Verified
Correct Answer:
Verified
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