How about this Therory. Maybe each race is from different planets, maybe it's not just one Planet. Jesus appeared all over the world to people. They all have their own way to get to the same place. Perhaps we are all supposed learn from each other.
On the Topic of Galaxies, the milky way has a black hole but I've read that once you go through the black hole your stuck. Scholars just discovered another black hole over 50 million light years away. This black hole is said to be larger than the milky way galaxy.