It looks like all the galaxies in the universe appear to be moving away from our own. Why?

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Hubert KochLv2

26 Sep 2019

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Why do virtually all the galaxies in the universe appear to be moving away from our own?

apricotmink264

Which of the following is a consequence of Hubble's Law?

A) the Big Bang

B) all galaxies are moving away from us equally fast

C) the more distant a galaxy is from us, the faster it moves away from us

D) the closer a galaxy is to us, the faster it moves away from us

E) more distant galaxies appear younger

rosedeer521

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. The figure illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities:

(a) relative to galaxy 2 and

(b) relative to galaxy 5.

The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.