> There are people working for NASA who actually believe we will be able to launch to LEO for $55/kg. I mean, that works fine if you have something like a spac

> There are people working for NASA who actually believe we will be able to launch to LEO for $55/kg. I mean, that works fine if you have something like a space elevator: $ units # assuming 10cent/kWh[0] You have: 300 km gravity * (.1$/kWh) Definition: 0.081722083 US$ / kg You have: sqrt(G earthmass/earthradius) Definition: 7911.1468 m / s You have: (9km/s)^2 * (.1$/kWh) Definition: 2.25 US$ / kg You have: ((9km/s)^2+300 km gravity) * (.1$/kWh) Definition: 2.3317221 US$ / kg So lifting stuff to LEO should cost ~2.50$/kg in energy at current retail prices. Adding (merely) a factor of twenty in overhead to actually deliver that energy is significantly more iffy, though. 0: https://www.statista.com/statistics/183700/us-average-retail-electricity-price-since-1990/ https://www.statista.com/statistics/183700/us-average-retail...