A trajectory (red) in the planar circular restricted 3-body problem that orbits the heavier body a number of times before escaping into an orbit around the lighter body. The contours denote values of the Jacobi integral. The dark blue region is an excluded region for the trajectory, enclosed by a zero-velocity surface that cannot be crossed.
<a href="//commons.wikimedia.org/w/index.php?title=User:Anders_Sandberg&amp;action=edit&amp;redlink=1" class="new" title="User:Anders Sandberg (page does not exist)">Anders Sandberg</a>
<span class="int-own-work" lang="en">Own work</span>