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By contrast, in some cases, low-T/W interplanetary trajectories can be faster than the corresponding minimum energy (Hohmann) high-T/W ballistic trajectory. In effect, the low-T/W system begins to act like a "high"-T/W system in heliocentric space where the sun's gravity field is not as "steep" as that near a planet or moon. For example, the ballistic minimum energy (Hohmann) trip time from the Earth to Neptune is roughly...