UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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red end of the spectrum because they are shortened
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red end of the spectrum because they are lengthened
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blue end of the spectrum because they are shortened
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blue end of the spectrum because they are lengthened
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Detailed explanation-1: -The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.
Detailed explanation-2: -cosmological redshift An effect where light emitted from a distant source appears redshifted because of the expansion of space-time.
Detailed explanation-3: -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-4: -As the Universe expands, the distance between crests of the wave of light also expand, causing the wavelength to increase.