Potential Colonization
In 2003 NASA conducted a conceptual study called Human Outer Planets Exploration (HOPE) regarding the future human exploration of the outer Solar System. The target chosen to consider in detail was Callisto.
It was proposed that it could be possible to build a surface base on Callisto that would produce fuel for further exploration of the Solar System. Advantages of a base on this moon include the low radiation (due to Callisto's distance from Jupiter) and geological stability. It could facilitate remote exploration of Europa, or be an ideal location for a Jovian system waystation servicing spacecraft heading farther into the outer Solar System, using a gravity assist from a close flyby of Jupiter after departing Callisto.
In a December 2003 report, NASA expressed belief that an attempt for a manned mission to Callisto may be possible in the 2040s.
Read more about this topic: Callisto (moon)
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