The Interplanetary Transport Network (ITN) sounds like the stuff of science fiction writers like H.G. Wells or even George Lucas, but it is actually real, and has already been used. Simply put, the ITN is a collection of pathways through the solar system, governed by gravity and predicted by chaos theory, that require little energy for an object to traverse them. It has been likened to a celestial superhighway winding around the sun, planets and moons that could slash the amount of fuel needed by spacecraft to explore the solar system.
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