This is explicitly addressed in book 2, when Darcy launches the Deladier at higher than usual speed, and realizes afterwards that she has wasted energy bc air resistance is proportion to v^2 The up/down path is not energy free; ships are recharged on the moon (mentioned in bk 1) https://twitter.com/JASutherlandBks/status/1036977683803131904 …
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2/ Also, lunar orbit is not geo-stationary; the moon circles the center of the earth once every 28 days, whereas the surface of the earth circles the center of the earth once ever 1 day.
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Replying to @MorlockP
Does it talk about a space elevator being used when terraforming?
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