Galactic Disks Appear Blue Because

question 75

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.

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