A) explode in a supernova.
B) become a white dwarf that will slowly cool with time.
C) become a rapidly spinning neutron star.
D) become a black hole.
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Multiple Choice
A) It is a red giant that grows in luminosity until it dies in a planetary nebula.
B) It is a subgiant that gradually grows dimmer as its hydrogen-burning shell expands and cools.
C) It is a subgiant that grows in luminosity until helium fusion begins in the central core.
D) It is what is known as a helium-burning star,which has both helium fusion in its core and hydrogen fusion in a shell.
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