The Mars Cycler was introduced in 2077 in an effort to make getting to and from Mars easier and more reliable. Each Cycler was launched from Earth, and would rendezvous with a space station which would supply it with fuel tanks. After that, the crew would be launched, and they would dock with the cycler, and be on their way. Once they reached Mars, the Cycler would dock with a station in high martian orbit, and the crew would board the station, and go down in landers or spaceplanes. After that, a new crew would board, and they would head back to Earth where it would once again rendezvous with the space station, and take on new fuel tanks and a new crew. Another real-world sci-fi build. These are really fun. Tumblr