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What are the different types of nebulae?

Answer 1

Bright Diffuse Nebula, Planetary Nebula, and Supernova Remnant

Bright diffuse Nebula are areas of hydrogen gas where new stars are formed.
i.e. Great Orion Nebula

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The other two are connected to the dying stage of a star:
Planetary Nebula are the shells of gas that were thrown from red giant stars.
i.e. Cat's Eye Nebula

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Supernova Remnant are those leftover from a massive stars' explosion.
i.e. Crab Nebula

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Answer 2

Ian Aitchison

Nebulae can be classified into four main categories: 1. Emission nebulae; 2. Reflection nebulae; 3. Dark nebulae; and 4. Planetary nebulae.

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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.