Taken together, the observational and modeling results imply that many extrasolar systems harbor distantly orbiting worlds, though such planets are tough for astronomers to detect at the moment, researchers said.

MSN: Alien planets face danger from double-star systems

Just over 50 extrasolar planetary systems have so far been discovered and analysis of them shows just how unusual our local system is with its giant planets (Jupiter and Saturn) positioned well away from the Sun.

BBC: Star 'eats' a planet