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: http://zebu.uoregon.edu/2003/ph301/l7.html
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Was located at a distance of 2 million light years from us.
Hubble detected Cepheid Variables in M31 and by using the Period-Luminosity Relation
But let's back up a bit now and return to 1909 when
Einstein was thinking
about the nature of gravity.
In the late 19th century, it was noticed that the observations
of the position of Mercury did not agree with where Newtonian
Mechanics said it should be. This means that
Newtonian Mechanics is somehow an incomplete description.
Einstein postulated that gravity was the curvature of space time
and this is the essence of General Relativity:
Newton had assumed that space was flat
Okay, so how come we can observe the Universe? Next