Researchers announced last year that a previously known member of the Kuiper belt–a reservoir of frozen bodies that lies beyond Neptune’s orbit–has its own moon (SN: 6/9/01, p. 360: Nine Planets, or Eight?). Follow-up observations with the Hubble Space Telescope now reveal that the two components of this Kuiper belt curiosity, dubbed 1998 WW31, pivot about each other in the most elongated orbit of any two bodies in the solar system.
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