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What are the differences between a nebula and a planetary nebula?

Answer 1

Nebula is a huge cloud of gas and dust in space.Many stars take birth in these places.

A planetary nebula is a cloud of gas puffed out by a dying star at the end of its red giant stage; it appears as a ring from Earth and some of them have mass approximately half a million times that of the sun.

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Answer 2

Josiah Adams

A planetary nebula is a particular kind of nebula that is created when a star that is similar to the Sun reaches the end of its life cycle and sheds its outer layers, forming a shell around the star's remaining core that illuminates the surrounding gas and dust. A nebula is simply a cloud of gas and dust in space.

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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.