Phoebe

Phoebe's orbit around Saturn is in the opposite direction than the orbits of most objects in the solar system. This suggests Phoebe was a captured object, trapped by Saturn’s gravitational pull and brought into orbit. Scientists think Phoebe might have been part of an ancestral population of small, icy bodies called Centaurs which originated in the outer solar system but migrated inward. Centaurs are of special interest to scientists because they are thought to be primordial objects—leftovers of solar system formation that never coalesced into a planet. If indeed it is a captured Centaur, then images and scientific data of Phoebe taken by NASA’s Cassini spacecraft give scientists the first opportunity to study a Centau