Anti-gravity, a driving force of science fiction, may exist, say scientists. New evidence that the universe's expansion is speeding up may force astronomers to invoke anti-gravity in order to explain what they have seen. Astronomers told a Chicago conference that their studies of distant star explosions imply that there is another, exotic force pulling the universe outwards.
Since the universe began, it has been coasting outwards, inflating like a balloon. Until recently it was thought that gravity put a brake on the expansion. If anti-gravity exists, it means there is a new fundamental constituent of the universe which would cause big problems for current theories.