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physical object > natural object > celestial body > star > variable > irregular variable > cataclysmic variable > pulsating nova

pulsating nova comparison table

Subject	is a kind of	has definition
cataclysmic variable	irregular variable	A collective name for stars in which the brightness increases suddenly because of an explosive event. The class comprises supernovae, novae, recurrent novae, dwarf novae and flare stars.
pulsating nova	cataclysmic variable	A variable star, probably not a true nova, in which the change between more and less luminous stages is extreme. (also called recurrent novae)

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