Evidence of past liquid water (Gale crater lake-bed sediments, Jezero delta); sub-surface radar signatures of brines; methane detections (curiosity, non-monotonic). Noachian (~4 Gya) likely habitable; today cryogenic/arid except possibly…
Evidence of past liquid water (Gale crater lake-bed sediments, Jezero delta); sub-surface radar signatures of brines; methane detections (curiosity, non-monotonic). Noachian (~4 Gya) likely habitable; today cryogenic/arid except possibly…