Quote:
Originally Posted by ila
Astronomers tell us that the universe is expanding.
What is the universe expanding into?
Is it displacing anything as it expands?
How much more can it expand?
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There were 3 possibilities. The universe is closed, and therefore shaped like a 4D sphere, flat, or open, and shaped like a 4D hyperboloid. The WMAP probe has given us the answer. To very close approximation, the universe is flat. So it extends out to infinity in all directions.
It can still expand. The distance between two points in the universe will, on the whole, increase.
How much more can it expand? Forever.