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No. The gateway is not bound to Earth, if we interpret "bound to Earth if the Moon disappears" as not drifting into interplanetary space regardless of what instance the Moon's gravitational influence is disregarded. There's a neat property of zero-gain flybys: At the point of closest approach, the velocity vector of the spacecraft is parallel to ...


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Reading the linked questions, answers, and references (thanks @uhoh), particularly R. Whitley and R. Martinez, 2015, Options for Staging Orbits in Cis-Lunar Space and this figure: Leads me to believe that getting to a NRHO is much like an 'Apollo-style' lunar transfer (i.e., in plane, Hohmann-ish transfer orbit). The only difference comes in targeting the ...


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