GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What does the red-shift of light emitted by stars tell us about our universe?
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That the universe is cooling
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That the universe is a sphere
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That the universe is getting smaller
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That the universe is expanding
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Explanation:
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: -If the light received from galaxies indicates a shift towards the red end of spectrum of light, it means that the galaxies should be receding away (Doppler’s effect). Therefore we conclude that the universe is expanding.
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