Comment Re:No gain until we get primary materia from space (Score 1) 147
Some people think SpaceX's BFR may get costs to LEO down to $10/kg.
If my math works out, that gets your 100,000 tons of material in LEO for $900 million (transport costs only). Using BFR's estimated 165 tons/launch to LEO, that's about 600 trips.