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All these worlds are rife with resources waiting
to be utilized. Europa, Ganymede, and Callisto are all cloaked in
water ice, and Titan's nitrogen atmosphere is laced with methane.
The Jovian Planets themselves are rich sources of hydrogen,
oxygen, nitrogen, methane, ammonia, and
other useful stuff. And
let's not forget the sun itself as it contains 99.8% of the solar
system mass, and ought to be good for something. Comets are good
fun if you can catch them. Of course, with relative velocities in
the hundreds of kilometers/second that's not completely easy, but
hey, remember the applied determination.