Looking back at Mars

This month marks five years since Nasa's Phoenix touched down on Mars to explore the planet's surface. Dr Tom Pike reflects on the mission.

In an article for the BBC Science and Environment, Dr Pike, who worked on the Phoenix mission, and is now building more hardware for Insight, the next Martian launch, explains what we've learnt about the Red Planet since the landing in 2008.

BBC Science & Environment article 25/5/2013