re: Contradictions
There is an interesting contradiction between the need (when it's about going to space) to find the lightest materials and the huge masses available in space.
Water enables ores of raw material to be found on Earth, but in space it's a combination of atoms and I'm not aware of anywhere in the solar system (besides Earth) where extracting raw material would be simple. Plus the fact that satellites require sophisticated factories and complex engineering on Earth. I can't imagine it could suddenly be a lot simpler out there.