iD magazine - - Space -

Though their con­sti­tu­tion still can’t be ex­actly de­ter­mined, much is known about the sur­face com­po­si­tion and the in­ner work­ings of moons. In 2022 the ESA probe JUICE (Jupiter ICY moons Ex­plorer) will an­a­lyze con­di­tions for life on the Jo­vian moons Io, Europa, Ganymede, and Callisto. Cost: around $380 mil­lion.

IO GANYMEDE metal­lic core of iron or nickel 30- mile- thick magma layer man­tle of sil­i­cate rock rock layer liq­uid iron core salt­wa­ter ocean ice layer iron core

EUROPA CALLISTO rocky man­tle ice layer un­der­ground ocean core of sil­i­cate rock and wa­ter ice ice layer

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