Galaxies

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What is a galaxy?

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A galaxy is a massive system that consists of stars, star clusters, planetary systems, gas, dust, and dark matter, all bound together by gravity.

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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 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 features of spiral galaxies, often containing 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.

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What is the Milky Way Galaxy?

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The Milky Way Galaxy is the spiral galaxy that contains our solar system and is characterized by its distinct spiral arms.

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How are galaxies classified?

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Galaxies are classified based on their observable characteristics, primarily their shape.

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What is the largest known galaxy?

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The largest known galaxy is IC 1101, which is a supergiant elliptical galaxy.

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What is the difference between a galaxy and a solar system?

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A galaxy is a vast collection of stars and other celestial bodies, while a solar system consists of a star and the objects that orbit it, including planets.

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What is dark matter?

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Dark matter is a form of matter that does not emit light or energy, making it invisible, but it exerts gravitational effects on visible matter.