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H II Regions and Stellar Nurseries
Grade Level
Astronomy
AST.214 H II Regions and Stellar Nurseries
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Which sentence best summarizes why an H II region is evidence for recent massive star formation?
A
The ionizing stars are short-lived, so their nebular glow marks very young star-forming sites.
B
H II regions form only after all stars in a cloud have died (in this case).
C
The gas can be ionized only by stars older than the Milky Way.
D
Neutral hydrogen automatically glows brightly without any radiation source.
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