Galaxies

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What is a spiral galaxy?

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A spiral galaxy is a type of galaxy characterized by its spiral arms that wind outward from the center, containing stars, gas, and dust.

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What is an elliptical galaxy?

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An elliptical galaxy is a type of galaxy that has an ellipsoidal shape and lacks the distinct arms found in spiral galaxies. They are often composed of older stars.

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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 defined shape or structure, often resulting from gravitational interactions with other galaxies.

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What are galactic clusters?

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Galactic clusters are groups of galaxies that are held together by gravity, often containing hundreds to thousands of galaxies.

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How many stars are typically found in a galaxy?

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Galaxies typically contain millions or billions of stars.

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What is the Milky Way?

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The Milky Way is the spiral galaxy that contains our Solar System, characterized by its distinct spiral arms.

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What is the difference between a spiral and elliptical galaxy?

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Spiral galaxies have a flat, rotating disk with spiral arms, while elliptical galaxies are more rounded and lack the spiral structure.

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What is a nebula?

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A nebula is a giant cloud of gas and dust in space, often serving as a nursery for new stars.

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What is the significance of dark matter in galaxies?

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Dark matter is an unseen substance that makes up a significant portion of a galaxy's mass, influencing its structure and the motion of galaxies.

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What is the role of supermassive black holes in galaxies?

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Supermassive black holes are found at the centers of most galaxies and play a crucial role in their formation and evolution.