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
John Carter of Mars (collection) not highly regarded by fans of the "Barsoom" series and is generally considered something of an afterthought. However, in the book "", Richard A. Lupoff, the editor of the 1964 Canaveral Press edition of "John Carter of Mars", writes that it is interesting for its contrast between "real" Burroughs ("Skeleton Men of Jupiter") and "ersatz" Burroughs ("John Carter and the Giant of Mars"). The copyright for this book has expired in Australia, and thus now resides in the public domain there. The text is available via Project Gutenberg Australia. John Carter of Mars (collection) John Carter of Mars is the