Meet the IPS
A "freeway" through the solar system resembling a vast array of virtual winding tunnels and conduits around the Sun and planets, as envisioned by an engineer at NASA's Jet Propulsion Laboratory, Pasadena, Calif., can slash the amount of fuel needed for future space missions.
It wasn't until the 1980s that the idea of exploiting manifolds for space travel was given serious consideration. But over the last few years, NASA mathematician Martin Lo and his team have built an elaborate theory around this idea. With increased computing power, these scientists used numerical experiments and did indeed find some such low energy paths. Each of these is like a valley carving through the potential energy landscape of the solar system. Spacecraft could flow along these channels practically effortlessly - barely needing thrusters to struggle against gravity.
Earth's Lagrange points are linked to those of Mars, or Saturn, by these minimal energy trajectories. Jupiter has Lagrange points associated with each of its many moons, all joined up into an interlinked web, which itself connects to the Earth system via the Jupiter-Sun Lagrange points. Spacecraft travelling along routes within this tube would be able to efficiently reach their destination. Any spacecraft that fly beyond the manifold, however, would enter the "unstable region" and their trajectory would inexorably stray further and further away from the low-energy tube. This collection of low-energy trajectory families spreads across the entire solar system, regularly interconnecting at Lagrange points into a vast system of tunnels. And the system is not stationary: the tubes forming the stable and unstable manifolds move with the planets, an ultracomplex heap of writhing interplanetary spaghetti.
these are moving gravitation tunnels or passages in 6D phase space.
Called the Interplanetary Superhighway, the system was conceived by Martin Lo, whose software was used to help design the flight path for NASA's Genesis mission, which is currently using this "freeway in space" on its mission to collect solar wind particles for return to Earth.
Most missions are designed to take advantage of the way gravity pulls on a spacecraft when it swings by a body such as a planet or moon. Lo's concept takes advantage of another factor, the Sun's pull on the planets or a planet's pull on its nearby moons. Forces from many directions nearly cancel each other out, leaving paths through the gravity fields in which spacecraft can travel.
The genesis mission in 2001 was the first human test of this invisible higher dimensional system.
We can't see it or guess where the IPS might be, finding the twisting constantly moving interplanetary passages leading from Lagrange points requires complex calculations done computational devices (GPUs) optimized for speed.
Genesis demonstrates well the power of mathematical analysis using computers and the advantages of chaotic regions. But it was not the first explorer, not by a long way, to have used the Interplanetary Superhighway. Some comets have been travelling along the ethereal tunnels for aeons, and the asteroid that wiped out the dinosaurs 65 million years ago is believed to have reached Earth through the IPS
https://www.jpl.nasa.gov/missions/genesis/
https://plus.maths.org/content/lagrange-and-interplanetary-superhighway
http://math.ucr.edu/home/baez/lagrange.html