GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A galaxy is a collection of gas, dust, stars and planets held together by:
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Protostars
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Helium
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Heat
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Gravity
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Explanation:
Detailed explanation-1: -Galaxy clusters typically have the following properties: They contain 100 to 1, 000 galaxies, hot X-ray emitting gas and large amounts of dark matter. Details are described in the “Composition” section.
Detailed explanation-2: -A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova. Other nebulae are regions where new stars are beginning to form. For this reason, some nebulae are called “star nurseries."
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