A star that suddenly becomes several magnitudes brighter and then gradually fades is a __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — nova
A nova is a star that exhibits a sudden, dramatic increase in brightness due to a thermonuclear explosion on its surface, followed by a gradual decline. This phenomenon is distinct from variable stars, which change brightness periodically, and is a recognized classification in celestial observation and astronomical navigation.
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