Who says the earth is the exact center of the universe, and how would one scientifically determine the center of something with no edges?
The eminent young-earth creationist scientist Dr. Russell Humphreys for one (here, too):
The idea that earth is at or near the center of the universe out of billions of galaxies is obviously unpalatable for anyone who denies purpose and design.It was also brought up, I believe, in the thread that you and I were on yesterday. Apparently a lot of young-earth creationists believe it.
As for how someone would scientifically determine such a thing, it beats me. But I keep getting told that Dr. Humphreys is a genius ahead of his time and that other scientists ignore him because they fear that he would expose them as hucksters.
If you continue to ask questions like this, you're going to end up in the doghouse, too. :-)