Exploration of Jupiter disadvantages for colonization because of the severe radiation conditions prevailing in Jupiter's magnetosphere and the planet's particularly deep gravitational well. Jupiter would deliver about 36 Sv (3600 rem) per day to unshielded colonists at Io and about 5.4 Sv (540 rems) per day to unshielded colonists at Europa, which is a decisive aspect due to the fact that already an exposure to about 0.75 Sv over a period of a few days is enough to cause radiation poisoning, and about 5 Sv over a few days is fatal. Ganymede is the Solar System's largest moon and the Solar System's only
Epithets of Jupiter southern peak was the most ancient sanctuary of the god, traditionally said to have been built by Romulus: this was the shrine of "Iuppiter Feretrius", which was restored by Augustus. The god here had no image and was represented by the sacred flintstone ("silex"). The most ancient known rites, those of the "spolia opima" and of the fetials, connect Jupiter with Mars and Quirinus, and are dedicated to "Iuppiter Feretrius" or "Iuppiter Lapis". From this earliest period, the concept of the sky god encompassed the ethical and political domain. "Juppiter Tonans" ("Thundering Jove") was the aspect ("numen") of Jupiter venerated