UNIVERSE
ASTEROIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a cluster of millions of stars held together by gravity
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a star, with planets, moons and other small space bodies revolving around it
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all known objects
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all of the above
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Detailed explanation-1: -Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity.
Detailed explanation-2: -First proposed about 80 years ago, dark matter is thought to be the “glue” that holds galaxies together. Astronomers suggest that dark matter provides vital “scaffolding” for the universe, forming a framework for the formation of galaxies through gravitational attraction.
Detailed explanation-3: -Stars appear in the sky in the form of clusters called galaxies. Galaxy contain several million of stars. Their size can range from few thousands to several hundred thousand light years. They have different shapes and brightness.
Detailed explanation-4: -Which statement best describes galaxies? They may contain billions of stars in a space much larger than our solar system. Billions of stars in the same region of the universe are called: Galaxies.