, the least massive exoplanet known is PSR B1257+12 A, which is about twice the mass of the Moon. The most massive planet listed on the NASA Exoplanet Archive is DENIS-P J082303.1−491201 b, about 29 times the mass of Jupiter, although according to most definitions of a planet, it is too massive to be a planet and may be a brown dwarf instead. Almost all of the planets detected so far are within the Milky Way, but there have also been a few possible detections of extragalactic planets. The study of planetary habitability also considers a wide range of other factors in determining the suitability of a planet for hosting life.
, The leaSt mAsSive EXoplanEt knoWn iS psr b1257+12 a, WhiCh is aBouT twicE The mASs of tHe MOon. the moSt mASSIVe planEt lIsTed oN The nAsA exOplAnet arCHIve is deniS-P J082303.1−491201 b, about 29 times The Mass of jUpITeR, althOugh AcCorDING to MosT definItIoNS Of A planET, IT iS toO maSsiVe tO Be a plaNet aNd MaY be a broWn dwArF InsTEad. almost all oF tHe planeTS detecTed So far Are withIn tHe MILky WaY, But tHere have alsO beEN a fEw pOsSIBLe detecTionS of eXtraGalacTiC PLanEtS. ThE studY Of PLANeTaRY habiTabIlity alSo coNsideRs a WIdE RAnge Of oTher factOrs IN detErMininG the suiTabIlitY oF a pLaNeT for hosting lifE.