If the Universe is ever expanding, what is at the center? Maybe it's the only perfect vacuum, or more optimistically, maybe it's a white hole that keeps the universe from expanding to the point where solar systems would be completely isolated from one another. What do you think?
At the center of the universe is a 9V battery powering all the stars in the universe to make light and reflect off respective moons to give light to the organisms of the moon's respective planet during their night time.
Didn't someone say the big bang is just still managing to cause the universe to expand and will eventually stop affecting everything, at which point things will start to go in reverse? Or maybe I'm mad...
No, you're right. What you're thinking of is the Big Crunch Theory. Don't feel like paraphrasing so here: " If the density of the universe is greater than the critical density, then the strength of the gravitational force will stop the universe from expanding and the universe will collapse back on itself. "-Wikipedia
However, since the universe is finite there should theoretically be an approximate center.
Think of the expanding universe as the surface of an inflating balloon. On that surface every point would be receding from every other point with the big bang as the start of that inflation. But you could not find a point on that surface that you could call "center".
What I meant is that I wasn't talking about looking for the center of the universe on the surface of the balloon. It would obviously take a while, but under close scrutiny you could track the movement of certain solar systems and use it to triangulate the approximate center of the universe.
There's a video on youtube, a lecture by Lawrence Krauss 'A Universe from Nothing' in which he explains why that's not possible. Every point (with a certain randomness, of course) is moving away from every other point, so that if you were to try triangulation you would find that apparently wherever you are right now is in the center of the inflation.
Allow me to demonstrate rather crudely:
Galaxies at t=0:
Galaxies at t>0, further apart:
Overlay of both with observer at the "center" galaxy:
Overlay of both with observer at the "bottom left" galaxy:
I hope that explains it a little better. Krauss of course does a better job at it than me.
Maybe, because the universe is still expanding the centre of the universe would be the exact location of the Big Bang itself. So there would be a huge amount of force pushing outward.....either that or some wierd sex scene, I still haven't decided.