GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As galaxies move away from us, the light waves we see coming from them are
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scrunched together.
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louder.
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not affected in any way.
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stretched out.
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Explanation:
Detailed explanation-1: -Light emitted from galaxies moving toward you would be squished, making the wavelength shorter and the light bluer. On earth, we perceive the light from galaxies moving away from us (as it appears almost all galaxies are) . . . . as being somewhat stretched, with longer wavelengths that make it look redder.
Detailed explanation-2: -Redshift occurs when the source of light is moving away from the observer. So when astronomers see redshift in the light from a galaxy, they know that the galaxy is moving away from Earth.
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