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40 years ago this week Viking 1 touched down on Mars; humankind's first lasting presence on another planet. Adam Rutherford speaks to Donna Shirley, who ran Nasa’s Mars exploration programme in the 1990s and Danny Glavin who looks after the Curiosity rover; currently roaming the red planet.

First broadcast on ´óÏó´«Ã½ Inside Science, 21st July 2016