Life on Mars

The thing that makes it difficult is because even if life had evolved on Mars, the chances of being preserved are very small. If we use Earth as a reference and our planet is teeming with life, yet it rarely preserves evidence of life of the fossil record. And the focus now is on exploring for habitable environments. If you're looking for water, a source of energy, either solar energy or thermal energy or chemical energy, and then organic carbon, assuming life as we know it on Earth based on carbon. So those are sort of the three things that we're looking for in the course of our mission.