Buzz Aldrin plans to have a chain of "orbiting hotels" by the year 2018. These vessels will use gravity from the sun, earth, and mars to propel them between the two planets, allowing shuttlecraft to intercept their orbit and bring passengers and supplies. The article is a little sketch on details like how long they expect one iteration of the orbit to take, and how fast the taxi craft will actually have to go to catch up, but the idea seems to solve a lot of the problems with interplanetary travel.
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