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 appearing chaotic.

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What is a galactic cluster?

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A galactic cluster is a group of galaxies that are held together by gravity, often containing hundreds to thousands of galaxies.

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What is the universe?

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The universe is the vast expanse that contains all of space, time, matter, and energy, including galaxies, stars, and planets.

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What is the distance measurement used by astronomers for distant objects?

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Light Years.

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

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A solar system consists of a star and all the objects that orbit it, while a galaxy is a collection of billions of stars, solar systems, and other celestial bodies.

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What is the Milky Way?

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The Milky Way is the galaxy that contains our solar system, characterized by its spiral shape.