Dennis Tito, who originally believed he could send two humans on a Mars flyaround in 2018 with funds from his own fortune and the philanthropy of others, has concluded he needs NASA's heavy-lift Space Launch System (SLS) to do the job, with $100 million a year in upper-stage upgrades from public funds spread over seven years. Tito, who paid Russia for a Soyuz ride to the International Space Station (ISS) in 2001, says the results of a design study find his “Inspiration Mars” mission ...

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