We meet the Silicon Valley entrepreneurs planning to explore - and mine - the solar system. Michael Sims, founder of Ceres Robotics, tells presenter Ed Butler why he thinks humans will soon become an interplanetary species - and he hopes his robots will lead the way. And Chris Lewicki explains how he hopes his company, Planetary Resources, will be the first to drill for water in outer space. Plus lessons in crisis management from Paul Sean Hill, Nasa's former director of mission control in Houston who has just written a book called Mission Control Management. (Picture: Spacex Falcon 9 rocket launch; Credit: Joe Raedle/Getty Images)