| 摘要 |
Orbital systems (28, 38) are provided which can be sustained with relatively low propellant requirements. The orbital systems (28, 38) comprise a plurality of earth-relative orbits, at least one of which is outside of the plane defined by the moon's earth-relative orbit (36). Transfers between the earth-relative orbits are achieved by using the moon's gravitational field. The orbital systems (28, 38) could be used to reduce the propellant requirements of lunar missions and could provide economic and life protecting advantages.
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