GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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moving away at a slower rate
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moving away at a faster rate
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not moving at all
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move away slowly at first and then speed up
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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.
Detailed explanation-4: -The latest results from the Hubble Space Telescope are shown above, a plot of recession velocity with distance (in megaparsecs, millions of light-years). The straight, linear correlation indicates that the Universe is currently expanding at a rate of 72 km per sec for every Mpc.