Horizon: Mission to Mars: A Horizon Special

An edition first shown in July 2012 focusing on Curiosity, Nasa's mission to investigate the possibility of life on Mars. The agency hoped to land a nuclear-powered rover vehicle, which cost $2.5billion to develop, on the surface of the planet by winching it down from a rocket-powered crane, then use it to explore the terrain. The programme features contributions by the project's chief scientist John Grotzinger and discovers the lessons experts learned from previous expeditions, many of which ended in failure