The second ExoMars mission will be launched in 2020 to target an ancient location interpreted to have strong
potential for past habitability and for preserving physical and chemical biosignatures (as well as abiotic/prebiotic
organics). The mission will deliver a lander with instruments for atmospheric and geophysical investigations and a
rover tasked with searching for signs of extinct life. The ExoMars rover will be equipped with a drill to collect
material from outcrops and at depth down to 2 m. This subsurface sampling capability will provide the best chance
yet to gain access to chemical biosignatures. Using the powerful Pasteur payload instruments, the ExoMars
science team will conduct a holistic search for traces of life and seek corroborating geological context information.
Key Words: Biosignatures—ExoMars—Landing sites—Mars rover—Search for life. Astrobiology 17, 471–510.
