'Alien asteroid' may be the oldest object in the solar system

By Will DunhamWASHINGTON (Reuters) - An "alien asteroid" that circles the sun in the giant gas planet Jupiter's orbital path, but hurtling in the opposite direction, is the first-known permanent resident of our solar system that astronomers have concluded originated in another star system.Researchers said on Monday a close examination of the asteroid's orbit indicated it formed elsewhere and was captured by gravitational forces when our solar system -- the sun, planets and various other objects