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Which types of galaxies have a clearly defined disk component?

Answer 1

Spiral galaxies, barred spiral galaxies, and lenticular galaxies.

If you had to pick between the main types (spiral, elliptical, and irregular), then it would be spiral. However, sometimes it is a bit more complex.

Spiral Galaxies consist of a central bulge and protruding arms. Sometimes, they have two arms that connect in a bar that crosses the center, and this is called a barred spiral galaxy. Lenticular galaxies are like a cross between spirals and ellipticals and are also disc-shaped.

Ellipticals are like big eggs or spheres, and irregular galaxies are unclear blobs. Peculiar galaxies do not fit into any of the other categories.

Here are some useful resources on galaxy types:
https://tutor.hix.ai https://tutor.hix.ai https://tutor.hix.ai

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Answer 2

Declan Carroll

Galaxies in a spiral galaxy have a distinct disk component.

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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.