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Astrodynamics/Lunar Trajectories
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
In order to get to the moon, a satellite or rocket needs to escape the Earth's gravity (a hyperbolic orbit). Once in the area of influence by the moon's gravity, the satellite needs to have enough velocity to enter into a stable orbit around the moon.
Earth-Moon 3-Body System
Basic Trajectories