I like Discworld's version: 
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What shape do you think it has? How do you think it expends and what will it become in the future?
Is it ever expending? Where does it come from? will it run out of momentum?
This is what i've been thinking:
Imagine the universe as a bagel, but not a cylindrical bagel more like a double cone with bases touching and the pointy, infinitely small end touching
now if you'd cut a slice off that bagel that would be a year, so the actual univers as experienced by x-y-z within a chosen space-time would be flat-ish. and the bagelwould be a timeline or the 4th dimension.
Now it doesn't HAVE to be bagel shaped it could be anything really as long as bot ends of it touches.
At one point in time the universe would have tostop expending and start contracting, I assume that would be when the gravity would finaly bleed enough of the universe's momentum to overcome it. That would be where the bases of the cones touch.
The pointy ends would represent the infinitely small blob of matter the universe would have contracted into that 'time' would be very short before the universe explodes and expend again into the exact same entity with the exact same events in the exact same time.
So the universe As I see it is an unending loop of the same things infinitely, but I fear that's my way of making the infinite finite. Please feel free to contradict me or explain tome how I am wrong. And do share your view of the universe.
P.S.: I'm shit at grammar and I'm french, please don't go all grammar nazy on my ass, that's not very productive.
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