8.8A Components of the Universe

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What is a galaxy?

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A galaxy is a system of stars, gases, and dust held 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 a nebula?

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A nebula is an interstellar cloud of dust and gases where stars can form.

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What holds the stars and matter in a galaxy together?

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Gravity holds the stars and all other matter in a galaxy together.

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What shape can a galaxy be?

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A galaxy can be lenticular, irregular, elliptical, or spiral shaped.

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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 difference between a planet and a galaxy?

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A planet is a celestial body that orbits a star, while a galaxy is a large system containing billions of stars, planets, and other celestial objects.

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What is the Milky Way?

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The Milky Way is the galaxy that contains our solar system.

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What is the role of gravity in the universe?

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Gravity is the force that attracts objects with mass towards each other, playing a crucial role in the formation and structure of 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 appearing chaotic.