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Career Officer
Join Date: Jun 2012
Posts: 447
# 16
12-01-2012, 12:47 PM
Actually, thanks to clever use of spectral imaging, we do have a pretty good idea of the composition of other worlds.

Ganymede and Europa are rich in water - in fact they are water worlds - and Mars and Titan have enough oxygen to meet human needs, provided it is refined with nuclear, solar or even wind power.