Timeline of Mars Science Laboratory microorganisms, as well as ancient water, including fluvio-lacustrine environments (plains related to ancient rivers or lakes) that may have been habitable. The search for evidence of habitability, taphonomy (related to fossils), and organic carbon on the planet Mars is now a primary NASA objective. On September 11, 2014 (Sol 746), "Curiosity" reached the slopes of Aeolis Mons (or Mount Sharp), the rover mission's long-term prime destination and where the rover is expected to learn more about the history of Mars. "Curiosity" had traveled an estimated linear distance of to the mountain slopes since leaving its ""start"" point in Yellowknife Bay
Opportunity (rover) ceased communications on June 10 and entered hibernation on June 12, 2018. It was hoped it would reboot once the atmosphere cleared, but it did not, suggesting either a catastrophic failure or that a layer of dust has covered its solar panels. NASA hopes to reestablish contact with the rover, citing a windy period that could potentially clean off the solar panels of the rover. The primary surface mission for "Opportunity" was planned to last 90 sols (92 Earth days). The mission has received several extensions and has been operating for days since landing. An archive of weekly updates on