We are back on Mars with NASA's newest rover, Perseverance. This mission is tasked with answering the age-old question of whether Mars has ever harbored life. We should remember that all the previous robotic visitors since the 1970s have had this same objective. The theory of abiogenesis or chemical evolution, that biologic systems evolved from nonbiologic chemicals, is strongly embraced by most of the theorists and designers of the Martian rovers. Their mission, in part, is to validate the theory of evolution. Beyond accessing the geologic history of Mars, the rovers, using onboard spectrometers, search for the molecular vestiges of past life on Mars. In doing this, they look for chemical signatures that can be made only by biological processes.