A spacecraft which cycles between the planet Earth and the planet Mars, in its own orbit which intercepts both their orbits at times when the planets are at those points in their orbits; which allows transfers to and from Earth and Mars, and transport to and from Earth and Mars.
Aldrin + cycler. From Buzz Aldrin, 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.
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