Galactic Disks Appear Blue Because

question 65

Multiple Choice

Galactic disks appear blue because:

• A)they contain no G, K, or M dwarfs.
• B)they contain only blue reflection nebulae.
• C)dust obscures the longer, red wavelengths.
• D)O and B blue giants are much brighter than G, K, or M dwarfs.
• E)dark matter gravitationally shifts all wavelengths towards the blue.

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