I know i'm not a big on mathmatics and physics but i do think about the big bang. Why are we expanding in one big circle? Is it a possibility that after the big bang there was one huge blackhole? because i read somewhere that when our sun dies out it might turn into a blackhole and that our planets will either get sucked in or keep expanding. Maybe thats why we cannot find the source to our gravity? because the source died out. See with zero gravity if a source spins something and then take away the source it will still keep spinning.