Two planets of roughly the same volume and mass are orbiting each other. What would be the most efficient way to travel from one to the other? Seems unlikely, but could a rocket positioned at the center of the near side of one of the planets just simply travel upwards? Or is it pretty much the same maneuver as getting to the moon? If so would having the center of rotation closer to the center of the two bodies have an effect on fuel consumption?

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    $\begingroup$ Keep in mind that two such planets would likely become rotation locked, so the same side of each planet is always facing the other. This is just like one side of the moon is always facing the earth. Launching near the equator on the far side of one planet therefore sounds like the lowest energy way to get to the other planet. $\endgroup$ – Olin Lathrop Oct 7 '13 at 12:49

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