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This is not a solved problem. SpaceX is working on it, but they're currently around $6k per kilogram [1], with hopes to get to $1100 or less per kg [2].

Cost-to-orbit reduction is not a sexy or scientifically interesting problem to solve, but Nasa needs to put as a top priority. As the parent post stated $100 per kilo means all of their other plans go from being grandiose to realistic.

[1] - http://behindtheblack.com/behind-the-black/essays-and-commen... [2] - http://en.wikipedia.org/wiki/SpaceX#Background

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