Life on Mars Ca(ClO) in the Phoenix soil has not interacted with liquid water of any form, perhaps for as long as 600 Myr. If it had, the highly soluble Ca(ClO) in contact with liquid water would have formed only CaSO. This suggests a severely arid environment, with minimal or no liquid water interaction. The Mars Science Laboratory mission is a NASA project that launched on November 26, 2011, the "Curiosity" rover, a nuclear-powered robotic vehicle, bearing instruments designed to assess past and present habitability conditions on Mars. The "Curiosity" rover landed on Mars on Aeolis Palus in Gale Crater, near Aeolis Mons
Mars 2020 that were under consideration for Mars 2020. A workshop was held on 8–10 February 2017 in Pasadena, California, to discuss these sites, with the goal of narrowing down the list to three sites for further consideration. The selected sites are: In November 2018, it was announced that Jezero crater was chosen as the planned landing site for Mars 2020 rover. A key mission requirement for this rover is that it must help prepare NASA for its Mars sample-return mission (MSR) campaign, which is needed before any crewed mission takes place. Such effort would require three additional vehicles: an orbiter, a