▁outer most ▁Sol ar ▁System ▁beyond ▁ 2 0 0   AU ▁and ▁up ▁to ▁ 1 5 0 0   AU ▁is ▁she ph erd ing ▁these ▁smaller ▁bodies ▁into ▁similar ▁or bits ▁( see ▁Planet ▁X ▁or ▁Planet ▁N ine ). ▁The ▁extreme ▁trans - Ne pt un ian ▁objects ▁ ▁and ▁, ▁announced ▁in ▁ 2 0 1 6 ▁and ▁co - dis cover ed ▁by ▁She pp ard , ▁further ▁show ▁a ▁likely ▁unknown ▁massive ▁planet ▁exists ▁beyond ▁a ▁few ▁hundred ▁A U ▁in ▁the ▁Sol ar ▁System , ▁with ▁ ▁being ▁the ▁first ▁known ▁high ▁semi - major ▁axis ▁and ▁high ▁peri hel ion ▁object ▁anti - aligned ▁with ▁the ▁other ▁known ▁extreme ▁objects . ▁In ▁ 2 0 1 8 , ▁the ▁announ cement ▁of ▁the ▁high ▁peri hel ion ▁inner ▁O ort ▁cloud ▁object ▁ ▁( nick named ▁" The ▁G ob lin ") ▁by ▁She pp ard ▁et ▁al ., ▁being ▁only ▁the ▁third ▁known ▁after ▁ ▁and ▁Sed na , ▁further ▁demonstrated ▁that ▁a ▁super - E arth ▁planet ▁in ▁the ▁distant ▁solar ▁system ▁likely ▁exists ▁as ▁ ▁has ▁many ▁orb ital ▁similar ities ▁as ▁the ▁two ▁other ▁known ▁inner ▁O ort ▁cloud ▁objects . ▁ ▁Most ▁notable ▁discover ies ▁▁ ▁She pp ard ▁has ▁been ▁involved ▁in ▁the ▁discovery ▁of ▁many ▁small ▁Sol ar ▁System ▁bodies ▁such ▁as ▁trans - Ne pt un ian ▁objects , ▁cent a urs , ▁com ets ▁and ▁near - E arth ▁objects . ▁ ▁Three ▁com ets