Astronomy Interview Question:

How big is the universe?

Submitted by: Administrator

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 that. This horizon describes the visible universe-a region some 28 billion light years in diameter.
Submitted by: Administrator