To quote David Warmflash in this series: “Since the dawn of the Space Age, the planet Mars has been the focus of two ambitious projects. One is the search for life forms native to the planet; the other is human colonization.” (from “Life on Mars? Will we find it? Will we colonize the Red Planet?”). Dr. Warmflash was in the first cohort of NASA astrobiology postdoctoral trainees and served as a member of NASA’s Jupiter Icy Moons Orbiter Science Definition Team. He examines different aspects of space colonisation in this series of articles.