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I'm have a problem understanding how to connect the fact that the universe is infinite, flat, had any particular size...

consider curved space where going enough forward will eventually bring you backwards but that's irrelevant

Quote from: SpaskibaI'm have a problem understanding how to connect the fact that the universe is infinite, flat, had any particular size...This may be confusing some concepts:finite (ie does not go on forever) and bounded (ie has a distinct boundary).flat (ie obeys Euclidean geometry) and curved (ie does not obey Euclidean geometry, if you measured it accurately enough, on large enough scales) A 2-dimensional analogy may be the surface of the Earth, which has a finite area, but has no distinct boundary, so if you continue in one direction, you eventually reach your starting point. It is curved on the local scale (hills and valleys) and on the global scale, but you would have trouble proving this with parallel lines drawn on a sheet of paper.A hint of this is contained in the dismissiveQuoteconsider curved space where going enough forward will eventually bring you backwards but that's irrelevantWe can't measure the universe well enough, or see past the Big Bang to determine if we would arrive back at our current location, if we left at some time in the past.The discovery of Dark Energy suggests that if we left now with an ion drive spaceship, we would not arrive back at our starting point, because the universe would have expanded faster than we could travel.All our measures suggest that while space is curved on the scale of solar systems & galaxies, it is flat on larger scales. But perhaps we are not measuring on a large enough scale?

Ok aside from correcting me, thanks btw, how could have the universe had a finite size in the past?

Quote from: Spaskiba on 12/01/2016 02:04:04Ok aside from correcting me, thanks btw, how could have the universe had a finite size in the past?I personally believe that "our universe" was just a finite local event which occurred within an infinite spatial expanse. I can't prove that hypothesis so don't ask me to so. My position is very much like so many other opinions on this subject, the information we need lies somewhere beyond the big bang and out of reach. We are left with only speculation.

As much as I like theories and ideas, I like them only where we're stuck, right now we still didn't resolve the problem

how could have the universe had a finite size in the past?