SpaceX sends 4 astronauts to the ISS. What’s the future of space tourism?

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Elon Musk’s Hawthorne-based company, SpaceX, recently delivered four astronauts to the International Space Station (ISS). The trip marks the first time a private company has ferried space travelers to the station. What’s the possibility that a private company will then take private citizens — paying customers and not career astronauts — up to the station for a visit?