How is a planetary nebula formed?

Answer 1

When most of the hydrogen is finished the stars start to swell.

Stars like Sun is in equilibrium with radiation push outwards and gravity pulls in wards. When most of hydrogen is finished the mass become less.Pull of gravity is reduced and the star began to swell to red giant.. Slowly outer layers are puffed out and forms planetary nebula.Inner core become a white dwarf,
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Answer 2

Audrey Arnold

A planetary nebula is created when a low to intermediate mass star reaches the end of its life cycle, usually when it has run out of nuclear fuel and is starting to shed its outer layers. This process reveals the star's hot core, which ionizes the surrounding gas and causes it to glow. The nebula then expands and eventually dissipates while the core cools down to become a white dwarf.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.