HR Diagram/ Components of The Universe 8.9A

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What is an Elliptical Galaxy?

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A type of galaxy that has an elongated shape and lacks the distinct spiral arms found in spiral galaxies. They are generally older and contain less gas and dust.

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What is a Comet?

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A small celestial body made of ice, dust, and rocky material that, when passing close to the sun, heats up and releases gas and dust, forming a glowing coma and tail.

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What is a Galaxy?

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A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity.

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What is the HR Diagram?

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A graphical tool that astronomers use to classify stars based on their luminosity, color, temperature, and evolutionary stage.

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What is a Nebula?

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A giant cloud of dust and gas in space, often the birthplace of stars.

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What is a Star?

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A massive, luminous sphere of plasma held together by gravity, undergoing nuclear fusion to produce energy.

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What is a Planet?

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A celestial body that orbits a star, is spherical in shape, and has cleared its orbit of other debris.

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What is a Meteor?

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A small rocky or metallic body in outer space that becomes a bright streak of light when it enters the Earth's atmosphere.

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What is the difference between a Galaxy and a Nebula?

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A galaxy is a large system of stars and other celestial bodies, while a nebula is a cloud of gas and dust within a galaxy.

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What is the significance of the mass of a Galaxy?

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The mass of a galaxy determines its gravitational pull, affecting the motion of stars and other objects within it.