If SpaceX gets lucky the BFR development costs could come in at the $2 billion low-end estimate. Elon Musk had estimated that it would cost $2 billion to 10 billion to develop. A few more critical successes over the next year will enable SpaceX to solidify the finances and funding for the BFR. The needed critical successes are the NASA crewed launch certification in mid-2019 and successful Falcon Heavy launches in 2019. SpaceX has pre-sold a moon orbit tourist flight to a Japanese billionaire. This was likely for $500 to $800 million. The SpaceX Falcon Heavy already has up to...