“…Nearly all of the interplanetary round trip analysis to date has focused on minimum energy round trips or small deviations from minimum energy. (See, for example, the excellent work by Aldrin [1985], Friedlander, et al [1986], Hoffman and Soldner [1985], Hoffman, McAdams, and Niehoff [1989], Polsgrove and Adams [2002], and Young [1988].) Certainly this is a practical approach given the high cost of rocket travel.…”