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Galaxy Mass, Luminosity, Color, and Gas
Grade Level
Astronomy
AST.230 Galaxy Mass, Luminosity, Color, and Gas
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Which statement is a safe conclusion from this pattern: higher gas fraction galaxies in a sample also have bluer colors?
A
Blue color means a galaxy contains no stars.
B
Gas fraction measures only the distance to the galaxy.
C
Gas-rich galaxies in the sample likely have more recent star formation.
D
Every gas-rich galaxy must have exactly the same mass.
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