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What is a protostar?
A young forming star before it becomes a stable main-sequence star
What happens during the main-sequence stage?
The star fuses hydrogen into helium in its core.
What happens to a Sun-like star after the main sequence?
It becomes a red giant.
What is a red giant?
A later stage when a Sun-like star expands greatly.
What is a planetary nebula?
Material released from the outer layers of a dying Sun-like star.
What is a white dwarf?
The hot, dense leftover core of a Sun-like star.