GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Why is the light from distant galaxies red-shifted?
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They produce more red light than nearby galaxies
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They are moving away from us
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The longer wavelengths are filtered out more by dust
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They are moving toward us
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Explanation:
Detailed explanation-1: -Ever since 1929, when Edwin Hubble discovered that the Universe is expanding, we have known that most other galaxies are moving away from us. Light from these galaxies is shifted to longer (and this means redder) wavelengths-in other words, it is ‘red-shifted’.
Detailed explanation-2: -The light of very distant galaxies passes through the vastness of space which because of its expansion causes the wavelengths of the light to get stretched out toward the frequencies and wavelengths of red. This is also called cosmological redshift.
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