EntityQ73994· pop 14· linked from 53 articlesfree-return trajectorySign in to savetrajectory of a spacecraft to a secondary body which allows the vehicle to return to the primary body without propulsionConnectionsapsisEntityMars DirectEntityEarthConceptMoonConceptPacific OceanEntitygravityEntityNASAConceptInternational Standard Book NumberEntityWayback MachineEntityspacecraftEntityApollo 11Conceptdigital object identifierEntityArtemis IIConceptApollo 13ConceptApollo 8Entitylow Earth orbitEntityApollo 12EntitytrajectoryEntityApollo 10Entityinertial frame of referenceEntityCategoriesApollo 13Apollo programEarth orbitsHuman missions to MarsThree-body orbits