The CURRENT POPULAR MODEL of the universe is, indeed, that it is finite but expanding. raenna pointed out that there was an experiment that proved that the background microwave radiation that is constant throughout the universe--this experiment helped substantiate the big-bang theory (look up penzias and wilson in google for more info).
i may be counter-intuitive to think of the universe as finite, but consider the issue of us people before copernicus. it would appear obvious that the earth stretches in all directions as far as can be imagined, and as no edge had been found, it would seem that the world is flat and possibly infinite. but that's only if you think of the earth as having 2-dimensions. when you add the third dimension, it is clear that the world can have no edge and still be finite.
similarly with the universe. if the entire thing is curved in the 4th dimension, it can be finite and still not have an edge.
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oh baby oh baby, i like gravy.
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