End, Other Side of Universe
I hear reference to the end of the universe or
the other side of the universe.
Is there actually an end or other side? If so, how does anyone know this.
One gets into a bit of "definition of terms" here. It is difficult
to see any justification for "the other side" of the Universe,
because that would be part of the Universe too. The best current
theory based on background microwave radiation puts the age of the
Universe at some 13.6 billion years or so. Multiplying by the speed
of light (and assuming that it remains constant) that sets an event
horizon beyond which we cannot presently "see", so the Universe may
be larger than that, but we have no way of knowing. The current
state of cosmology is very speculative -- a lot of possibilities
based on relative sparse data -- so the jury is still in session on
a lot of these issues.
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Update: June 2012