This week, we’re looking one orbit outward, at the little red planet that’s inspired so much science and science fiction. Guest host Marie-Claire Shanahan talks to University of Tennessee geologist Linda Kah, about her work as part of NASA’s Mars Science Laboratory mission, analyzing the images sent back by the Curiosity rover. And she’ll speak to geologist Chris Herd, curator of the University of Alberta’s meteorite collection, about using rare meteorites from Mars to study the planet’s composition and atmosphere.