The big bang didn't really happen.
I forgot about this one. The universe is a four dimensional sphere (so is a black hole) that has no edge or centre. Everywhere is in the centre from its own perspective, like the surface of the Earth. When you look across a curved surface the light waves get stretched making them red shifted, and obviously more red shifted the further away you look. If you travel in straight line in any direction (including time) you would eventually end up back where you started. You wouldn't remember though if you did it in time because you can't get information through a singularity, even if that's not what it would look like if you were actually there.