History of the Universe and Earth

[Bridge]

Stephen Hawking has a nice explanation of his (partially his) so-called "Boundless Universe Theory" in "A Brief History of Time" which says that the universe is sort of like Earth in that there is no beginning or end per se and yet it is not infinite. But since the universe is constantly expanding it is only theoretically possible to do a lap around it according to this theory. Personally I think it makes by far the most sense, and ties up some pesky knots like the fact that the universe appears to repeat itself in every direction. I'm not really an expert so that may be completely untrue, but it's my interpretation of things.