Transfers to the Moon

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Because halo orbits are unstable, it is very cheap, in terms of fuel, to leave the halo orbit and travel to other locations. With just a small nudge from thrusters at the right time and in the right direction, the spacecraft can "fall off" of the halo orbit in a controlled manner and descend down to the Moon. In this graphic, two mated spacecraft were on a halo orbit, but one of the spacecraft separated, performed a small maneuver (~2 m/s) and descended down to the Moon, where a large insertion maneuver is required to become captured into a lunar orbit. This insertion maneuver is still somewhat smaller than the lunar insertion maneuver in an Apollo-type transfer. Lunar orbits of any inclination and altitude can be reached using this technique.

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