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The Question
(Submitted February 12, 1999)
Can two areas of the Universe be so far away from each other
that the light from area A can not reach area B?
The Answer
It is now believed that the Universe is large enough that there can be
areas A and B that have not been able to exchange light.
This is a result of recent observations that indicate that the rate of
the Universe's expansion is speeding up, contrary to what astronomers were
expecting a couple of years ago.
David Palmer and Samar Safi-Harb
for Ask a High-Energy Astronomer
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