How can you differentiate between the three different types of galaxies?
This is an oblique response, but there used to be a superb website called Galaxy Zoo that taught me to do it.
They are essentially categorized solely based on their visual qualities, such as the presence of a bar, spiral structure, etc.
A galaxy's side-on orientation can be difficult to determine, but other indicators, like a central bulge, can be helpful.
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The three main types of galaxies are elliptical, spiral, and irregular. They can be differentiated based on their shapes, structures, and characteristics:
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Elliptical galaxies: They have a smooth, ellipsoidal shape with no distinct spiral arms. They contain mostly older stars and lack significant interstellar matter.
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Spiral galaxies: They have a distinct spiral arm structure, containing both older and younger stars. Spiral galaxies also have interstellar matter, including gas and dust, which contribute to ongoing star formation.
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Irregular galaxies: They lack a defined shape and structure, often appearing chaotic. Irregular galaxies contain young stars, gas, and dust, with ongoing star formation activity.
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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.
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.
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.
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.
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