GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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big bang
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dark energy
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dark matter
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cosmic background radiation
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Hubble’s Law
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Detailed explanation-1: -Hubble’s law, also known as the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. In other words, the farther they are, the faster they are moving away from Earth.
Detailed explanation-2: -How did Edwin Hubble discover that galaxies were moving away? By comparing the distances between the galaxies and their speeds away, astronomers realized that the more distant galaxies were moving away at a greater speed. Hubble’s law determines the speed of a galaxy’s retreat as a function of its distance.
Detailed explanation-3: -By taking the spectrum of a distant object, such as a galaxy, astronomers can see a shift in the lines of its spectrum and from this shift determine its velocity. Putting this velocity into the Hubble equation, they determine the distance.