GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The stars and all the other matter in a galaxy are held together by which of the following?
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Dark matter
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Inertia
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Gravity
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Magnetism
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Explanation:
Detailed explanation-1: -Dark matter, the invisible stuff whose gravity is thought to hold galaxies together, may be the least satisfying concept in physics.
Detailed explanation-2: -Most galaxies are not alone in the vast expanse of space, but are connected to one or more other galaxies by gravity. The same force that holds you onto the Earth can keep many individual galaxies bound together.
Detailed explanation-3: -This is called nuclear fusion, and it’s why a star shines. As the hot gas pushes outward, it opposes the inward pull of gravity. This balance of forces is what makes a star, a star. It holds the star together and keeps it at a steady temperature for most of its life.
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