Which part? Why cars rust?
If all those worlds were splitting off from ours, they would need the same total mass-energy as ours to exist. It would violate the law of conservation of energy if more than one manifested itself.
Space/Science » in reply to :) Can you back this up?
If all those worlds were splitting off from ours, they would need the same total mass-energy as ours to exist. It would violate the law of conservation of energy if more than one manifested itself.