How big is the universe?
Question asked by: knowitall
There is an edge to what we are able to see in the universe. The most distant galaxies we can now see are 10 or 12 billion light-years away. We could never see a galaxy that is farther away in light travel time than the universe is old, e.g. estimated 14 billion years. Thus, we are surrounded by a "horizon" that we cannot look beyond. This horizon describes the visible universe—a region some 28 billion light years in diameter.
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