ସଂଘଟନ 80±3.2% hydrogen(H2)19±3.2% helium(He)1.5±0.5% methane(CH4)~0.019% hydrogen deuteride(HD)~0.00015% ethane(C2H6)Ices:*. ammonia(NH3)*. water(H2O)*. ammonium hydrosulfide(NH4SH)*. methane ice(?) (CH4•5.75H2O)