Because gravity doesn't directly conflict with what is in the bible?
But if Jesus is in Heaven, and Heaven is up above the clouds.. it should be constantly pulled down and sinking because of Earth's gravitational pull!
I don't think that the bible ever said that Heaven is above us, did it? I know that Dante talked about the planets and stars representing circles of heaven, but I'm not sure that he was basing that on anything.
I'm curious if the bible really does say that, though?