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Not even Titanium ...it is only about half the weight of steel.. The entire plan of adding a compressor and filling up the fuel tank with pure oxygen during the in atmosphere phase would add a lot of extra equipment and weight by itself. I think this entire concept is weird .. I mean how much...

Last update that I remember .. many many years ago . Was that for AVATAR concept to succeed the empty weight has to be reduced by 90 percentage.. basically waiting for future materials.