NASAEditor’s note: Jim Bell is a professor in the School of Earth and Space Exploration at Arizona State University and has worked on a number of Mars missions. On Feb. 18, NASA’s Mars 2020 mission will be arriving at the red planet, and hopefully will place the Perseverance Rover on the surface. Bell is the primary investigator leading a team in charge of one of the camera systems on Perseverance. We spoke with him for The Conversation’s new podcast, The Conversation Weekly.What’s the goal of this mission?What we’re looking for is evidence of past life, either direct chemical or organic signs in the composition and the chemistry of rocks, or textural evidence in the rock record. The environment of Mars is extremely harsh compared to the Earth, so we’re not really looking for evidence of current life. Unless something actually gets up and walks in front of the cameras, we’re really not going to find that.Read more at The Daily Beast.