Galaxies

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What is a spiral galaxy?

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A spiral galaxy is a type of galaxy characterized by a flat, rotating disk containing stars, gas, and dust, along with a central concentration of stars.

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How many stars can be found in a galaxy?

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A galaxy can contain millions or billions of stars.

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What type of galaxy is the Milky Way?

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The Milky Way is classified as a spiral galaxy.

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

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Astronomers use light years to measure distances to distant objects.

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What is an example of something that is not a galaxy?

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An optical galaxy is not considered a true galaxy.

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What are the main components of a spiral galaxy?

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The main components of a spiral galaxy include a central bulge, spiral arms, and a halo of stars and dark matter.

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What is the difference between elliptical and spiral galaxies?

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Elliptical galaxies are more 3-dimensional and lack the flat structure of spiral galaxies, often appearing as ellipses.

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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 significance of dark matter in galaxies?

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Dark matter is believed to make up a significant portion of the mass in galaxies, influencing their structure and rotation.

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How do astronomers classify galaxies?

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Astronomers classify galaxies based on their shape and structure, primarily into spiral, elliptical, and irregular categories.