By definition, travel between bodies in a given star system. For our solar system, the velocities involved are significantly higher than those needed for orbital maneuvers, and conventional rockets are for the most part inadequate for interplanetary craft. As a result, most interplanetary travel makes use of gravitational slingshot effects to effect velocity changes and gain speed. A prime example of this are the [voyager spacecraft]
?, which used slingshot effects to change trajectories several times in the outer solar system.
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