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Measurements from the satellite XMM Newton have shown
that younger clusters of galaxies (those which formed 10 Billion
years ago) where bigger than clusters of galaxies formed
later. This was
concluded because younger clusters of galaxies emit less
x-ray radiation. Measurements also show
that in the past there were fewer clusters of galaxies than today.
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These observations came as a shock for older theories, but
can easily be explained by applying our contraction of space
theory.
The facts give us reason to ask: How is the universe pulling apart? -
The force driving the expansion of the
universe affects space from all sites simultaneously.

Now imagine 6 small galaxy clusters (illustration above) united in a
greater cluster. This will help you to imagine,
on a grander scale, thousands of small clusters of galaxy
bound by a common field of gravity.
The force behind the expansion of the universe, has increased the volume of very
huge cluster of galaxies that existed in the younger days of
our universe.
It may sound strange, but
we have reason to believe that our universe was
initially split into a few very large parts, and like a
nuclear chain reaction split into smaller parts, and likely
continues to do so.
In the young universe, when huge clusters were split huge
empty holes were left in the middle of where these galaxy
clusters once were. This is exactly what has happened. >
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