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The big bang theory was based initially on the discovery by Edwin Hubble that distant galaxies and clusters of galaxies are moving away from us and that the further away they are, the faster they are receding.
ok i have been thinking about this and if the universe is expanding and we (earth) are part of the universe why can we observe other galaxies moving away?
have we measured space, so how can we say it is expanding. if the only evidence is relative to the earth therefore we are not observing all of space.
if the galaxies futher away are expanding quicker why cant we find the location of the big bang
and there seems to be no other evidence apart from these expanding galaxies to justify the big bang.