Qeybta sare ee jawiga Jupiter waxay ka kooban tahay qiyaastii 88<unk>92% hydrogen iyo 8<unk>12% helium boqolkiiba mugga molecules gaaska. Atom helium wuxuu leeyahay qiyaastii afar jeer cufnaanta atom hydrogen, sidaa darteed isbedelka isbedelka marka lagu sharaxo saamiga cufnaanta ee ay gacan ka geysteen atoms kala duwan. Sidaa darteed, jawiga Jupiter wuxuu qiyaastii yahay 75% hydrogen iyo 24% helium by mass, iyadoo boqolkiiba hal ee haray ee cufnaanta ay ka kooban yihiin walxo kale. Jawiga waxaa ku jira tiro yar oo methane ah, biyo, ammonia, iyo xeryahooda ku saleysan silikoon. Waxa kale oo jira raadadka kaarboon, ethane, hydrogen sulfide, neon, oxygen, phosphine, iyo sulfur.
methane yar, uumiga biyaha, ammonia