What is the key difference in origin between a planetary nebula and a supernova remnant?
Answer
Planetary nebulae stem from dying sun-like stars; remnants stem from massive star explosions
Planetary nebulae are expelled shells from dying, sun-like stars, whereas supernova remnants are the expanding debris clouds resulting from the catastrophic explosion of a very massive star.
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Nebulae: Crash Course Astronomy #36 - YouTube
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