Quote:
Originally Posted by raymo
If the universe began with the big bang, and is still expanding[even accelerating its rate of expansion] then by definition it can't be infinite.
raymo
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I'm afraid it can
The Big Bang really is a bit of a poor description of what is the generally accepted theory. It is more like the "Big Expansion".
Current theoretical calculations have the universe at the time of the Big Bang being about the size of a watermelon. Within a trillionth of a trillionth of a second the universe expanded a trillion trillion times (I know, my numbers are a bit vague
), this is what is typically referred to as the Big Bang. So it refers to a localised part of space of a particular size. Whether that is the entire universe at its birth or if it was infinite and an infinite amount of those watermelon sized areas rapidly expanded... We'll never know.