Dennis Tito, the original space tourist who is staking a big chunk of his investment-fund fortune to send a man and woman on a hurry-up Mars fly-around in 2018, 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 over seven years. Tito, who paid Russia for a Soyuz ride to the International Space Station in 2001, released the results of a mission-design study Nov. 20 that he said would keep the U.S. ahead of ...

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