There is no "Return from a moon" script

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"We have to go back" - SHEPPARD, Jack

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This needs a hyperbolic trajectory parallel to the moon's retrograde. The escape velocity must be greater than the moon's escape velocity. For the Mun, it is about 135 degrees from retrograde, with an escape velocity of approximately 850 m/s.

https://en.wikipedia.org/wiki/Escape_velocity