GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Red shift of starlight is observed in 7 nearby stars. What do you know about their movement?
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The stars are not moving relative to Earth
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The stars are moving towards Earth
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The stars are moving away from Earth
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None of the above
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Explanation:
Detailed explanation-1: -Astronomers can measure this wobble by using spectroscopy. If a star is traveling towards us, its light will appear blueshifted, and if it is traveling away the light will be redshifted.
Detailed explanation-2: -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’.
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