[ExI] Material for the launch tower

[Rafal Smigrodzki]

Looks like we have a material that is more than sufficient to build a space
launch tower:

http://newsoffice.mit.edu/2014/new-ultrastiff-ultralight-material-developed-0619

If it could be made in bulk, building a tower for railgun-assisted space
launch should be a breeze.

Rafal
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