What is the name for the expanding shell of glowing gas created when a Sun-like star expels its outer layers?

Answer

Planetary Nebula

Once helium fusion in the core ceases for Sun-like stars, the outer layers are gently puffed away, creating a beautiful, transient structure known as a Planetary Nebula.

What is the name for the expanding shell of glowing gas created when a Sun-like star expels its outer layers?

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