Galaxies Review

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What is an irregular galaxy?

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An irregular galaxy is a type of galaxy that does not have a distinct regular shape, often appearing chaotic in structure. They are typically rich in gas and dust and are sites of active star formation.

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What is an elliptical galaxy?

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An elliptical galaxy is a type of galaxy characterized by its smooth, featureless light profile and an oval shape. They contain older stars and have little gas and dust.

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What are the main types of galaxies?

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The main types of galaxies are spiral, elliptical, and irregular.

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What is a spiral galaxy?

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A spiral galaxy is a type of galaxy that has a flat, rotating disk containing stars, gas, and dust, along with a central concentration of stars known as the bulge. They often have spiral arms.

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What is not considered a galaxy?

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An optical galaxy is not considered a galaxy; it refers to a visual phenomenon rather than a physical structure.

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What is the most abundant type of galaxy?

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The most abundant type of galaxy is the elliptical galaxy.

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What defines a spiral galaxy?

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A spiral galaxy is defined by its spiral structure, which includes arms that extend outward from the center, where new stars are often formed.

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What is the shape of elliptical galaxies?

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Elliptical galaxies have a smooth, circular, or oval shape.

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What is the significance of gas and dust in irregular galaxies?

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Gas and dust in irregular galaxies are significant because they are often sites of active star formation.

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How do elliptical galaxies differ from spiral galaxies?

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Elliptical galaxies are generally older, contain less gas and dust, and have a more uniform light profile compared to the structured arms of spiral galaxies.