Water on Mars of these salts". NASA also reported that Jake M rock, a rock encountered by "Curiosity" on the way to Glenelg, was a mugearite and very similar to terrestrial mugearite rocks. On December 9, 2013, NASA reported that Mars once had a large freshwater lake inside Gale Crater, that could have been a hospitable environment for microbial life. On December 16, 2014, NASA reported detecting an unusual increase, then decrease, in the amounts of methane in the atmosphere of the planet Mars; in addition, organic chemicals were detected in powder drilled from a rock by the "Curiosity" rover. Also, based on
Crewed Mars rover An early version of the SEV rover was tested in 2008 by NASA in the desert. The SEV for space or roving missions was designed to support two humans for 14-days, and would include a toilet, sleeping logistics, and one version has suitports to support EVAs. Another concept is a windows that allow looking at objects very close to the front of the rover but on surface (down and to the front). In the 1960s, the post-Mariner 4 design for a Mars Excursion Module, by Marshall Space Flight Center, including a cargo version carrying a pressurized Mobile Laboratory for Mars,