Galaxies

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What is a galaxy?

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A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, 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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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 a Spiral Galaxy?

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A Spiral Galaxy is characterized by its spiral arms that wind outward from the center, containing young stars, gas, and dust.

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What is an Elliptical Galaxy?

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An Elliptical Galaxy is shaped like an elongated sphere and is composed mainly of older stars with little gas and dust.

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What is an Irregular Galaxy?

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An Irregular Galaxy does not have a distinct regular shape and often results from the gravitational interactions of other galaxies.

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What is the significance of the Hubble classification scheme?

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The Hubble classification scheme categorizes galaxies based on their appearance, helping astronomers understand their formation and evolution.

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What is a barred spiral galaxy?

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A barred spiral galaxy is a type of spiral galaxy that has a central bar-shaped structure made of stars.

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What is the role 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 gravitational forces and structure.

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What is a galaxy cluster?

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