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The absolute minimum delta-v for getting from a circular orbit at 110km altitude to the the surface of a perfectly spherical moon would be around 1736 m/s -- a 25 m/s periapsis-lowering-to-surface burn, coast, and instantaneous 1711 m/s terminal burn -- this is effectively a Hohmann to zero altitude combined with an additional burn to go from orbital ...


For a more casual answer to this question--The Mythbusters built a replica of the lunar flag assembly. In a vacuum chamber they moved it around to see how the flag behaved in a vacuum. Dailymotion video Time index 11:30

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