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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What is the shape of the Milky Way galaxy?

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The Milky Way galaxy is a spiral galaxy.

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How do scientists classify galaxies?

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Scientists classify galaxies based on their shape, size, and brightness.

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What is the approximate age of the Milky Way galaxy?

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The Milky Way galaxy is approximately 13.0 billion years old.

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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.

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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.

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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.

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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 and detectable only through its gravitational effects.

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What is the significance of the Andromeda Galaxy?

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The Andromeda Galaxy is the nearest spiral galaxy to the Milky Way and is on a collision course with it.