GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Why is the Cosmic Microwave Background so cool now?
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The expansion of the Universe has cooled the radiation and stretched its wavelengths
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Dense clouds of dust have blocked most of it.
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The cosmological constant has “squashed” its wavelengths and cooled it.
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Hydrogen atoms have condensed on it and chilled it.
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Explanation:
Detailed explanation-1: -So as a result of the continual expansion of the universe, the light waves of this radiation have stretched out to longer wavelengths which today exist in the microwave region of the electromagnetic spectrum (which is why we call it the Cosmic “Microwave” Background).
Detailed explanation-2: -CMBR is a second piece of evidence to show the expansion of space, and this supports the Big Bang model of the origin of the Universe. The short wavelengths of the gamma radiation emitted in the initial explosion are believed to have become stretched due to the expansion of space into longer wavelength microwaves.
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