Life on Mars may be more than a David Bowie song in the near future if SpaceX CEO Elon Musk has his way. Musk announced his plan Tuesday to start manned missions to Mars by 2022. An entire self-sustaining colony of people living on Mars, he said, would take 40 to 100 years. There are plenty of feasibility questions bouncing around since Musk’s announcement, but what would life on Mars be like? Earlier this year, researchers with the University of Hawaii at Manoa finished a yearlong simulated Mars mission, in which six people lived in a two-story dome on top of a volcano for 365 days.