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, bound together by gravity.

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What are the three main types of galaxies?

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The three main types of galaxies are Spiral, Elliptical, and Irregular.

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What type of galaxy is the Milky Way?

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The Milky Way is a Spiral galaxy.

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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 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.

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What is an Irregular galaxy?

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An Irregular galaxy is a galaxy that does not have a distinct regular shape, often resulting from gravitational interactions.

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What is the largest known galaxy?

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The largest known galaxy is IC 1101, which is about 6 million light-years in diameter.

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What is the observable universe?

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The observable universe is the part of the universe that we can see and measure, estimated to be about 93 billion light-years in diameter.

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How many galaxies are estimated to be in the universe?

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It is estimated that there are over 2 trillion galaxies in the observable universe.

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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.