Science Forums 2

[trapit]

I dont understand the way we guessed the shape of the universe is spherical.Because sphere is a body coming out of three dimensions.We cant exactly say that there are only three dimensions.
seconndly i was in doubt about the fact that there will be no space and time after a certain limit.How can it be?May be we can say that the stars and other bodies we see will exist for a limited space(Because the total energy and hence matter of the universe is constant).But what about the null space?????