Dennis Tito's ambitious plan to send a married couple on a fast near-term tour of the inner Solar System is losing lift in the face of technical and fiscal reality, but his can-do spirit and choice of working partners is paying off in technology. A deeper dive into mission requirements ruled out the space-tourism pioneer's hope that his personal wealth could seed a two-person Mars flyaround in 2018, and his revised plan for a 580-plus-day trip to Mars via Venus is a long shot.
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