I dont think the Universe is infinite. Solely because it started off from apoint and a certain time has passed by thereby making the Universe finite and measureable. Even if it expands faster than light..
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Originally Posted by neutralino  Note that I never said that the universe "expands into" anything. The definition of "universe" is everything that exists; whether that be spacetime, or matter inside that spacetime. The universe may be infinite, or it may be finite; we don't really know yet. We do know, however, that the observable universe is much smaller than the total universe such that we can think of the universe as being infinite.
You're talking about "expansion of points" here, whereas I'm not. Points have no size, and so do not "expand" as the "universe expands." The correct thing to say is that the space between all points in space increases.
There are many ways of thinking of this. The number line example I give above is one way. Another would be to think of a uniform grid on an infinitely large sheet of paper. If this sheet of paper expands, then the distance between the vertices of a square on the grid paper will increase. But all the edges of the squares will increase in size; that is, there will not be any points that are closer after the expansion than they were before the expansion. This is what we really mean by "expansion of the universe" |