原推：The Space Shuttle cost on the order of $450 million to turn for re-launch
SpaceX now potentially at less than $1m https://t.co/JzlWbc9xpS
If time is directly correlated to cost, then our model suggests it costs less than $1 million to refurbish the first stage of the Falcon 9. https://t.co/cTFlCfXvoU