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How does the composition between irregular, spiral, and elliptical galaxies compare?

Answer 1

Michael Adkins

The PRIMARY distinction is simply their shape. Elliptical ones tend to have more "old" stars and less star formation.

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Excellent images of various galaxies, not directly related to the question: https://tutor.hix.ai

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Answer 2

Emilia Acosta

While spiral galaxies, like the Milky Way, have a flattened disk with spiral arms containing young stars, dust, and gas, older stars are found in the central bulge of these galaxies; elliptical galaxies are primarily composed of older stars with little gas and dust and frequently lack distinct spiral arms.

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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.