GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It tells scientists that the universe is shrinking
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It tells scientists that stars and galaxies are moving closer to Earth
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It tells scientists that the universe is expanding
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None of the above
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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: -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-3: -Evidence from red-shift This means that the further away the galaxies are, the faster they are moving. This is similar to an explosion, where the bits moving fastest travel furthest from the explosion. Red-shift data provides evidence that the Universe, including space itself, is expanding.