GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Planetesimals form in debris disks.
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Most galaxies are moving toward us.
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Uniform background radiation is detected in every direction
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Galaxies spin faster than they should based on visible matter.
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Detailed explanation-1: -Three key pieces of observational evidence lend support to the Big Bang theory: the measured abundances of elements, the observed expansion of space, and the discovery of the cosmic microwave background (CMB). The CMB refers to the uniform distribution of radiation that pervades the entire universe.
Detailed explanation-2: -The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background", or CMB.
Detailed explanation-3: -Answer: The two key pieces of evidence that support the Big Bang theory are the cosmic background radiation and the observed helium content of the universe.