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| | centaur |
 | | The orbits of the centaurs are dynamically unstable due to interactions with the giant planets, so they must be objects in transition from a large, outer reservoir of small bodies, believed to be the Kuiper belt, to potentially active, comet-like inner solar system objects. |
 | | Classification of centaurs is often difficult and there is clearly a continuum of types that includes centaurs, comets, asteroids, Kuiper belt objects, and other entities such as cubewanos and Scattered Disk objects. |
 | | Pholus, which orbits from Saturn to past Neptune, is a member of a subgroup known as red centaurs, remarkable for their surface coloration, which is believed to be due to a coating of organic materials. |
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