Aldrin cycler

Etymology
. After, who developed the concept and its mathematical basis. From being a cycler, a space vehicle which cycles between intercepts of two celestial bodies in their own orbits, with little or no orbital adjustments needed, on as close to pure ballistics as practicable.

Noun

 * 1)  A  which cycles between Earth and Mars, in its own orbit which intercepts both their orbits at times when the planets are at those points in their orbits; which allows transport from Earth to Mars, or vice versa.