Nonstandard techniques to deliver a payload from the Moon to Earth are explored. Two approaches are compared, which are based on using a space elevator and an acceleration device, the Artsimovich railgun. The energy needed to launch a payload to a low lunar orbit and the $L_1$ libration point in the Earth–Moon system is estimated. We conclude that the railgun is economically advantageous compared to the space elevator and standard jet technologies.
96.20.Jz Gravitational field, selenodesy, and magnetic fields
94.05.Jq Spacecraft sheaths, wakes, and charging
$^1$119234, Университетский проспект, 13
$^2$Indian Institute of Astrophysics, Bangalore