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) early June 2018, a large global-scale dust storm developed and within a few days the rover's solar panels were not generating enough power to maintain communications, with last contact on June 10, 2018. NASA stated they did not expect to resume communication until after the global dust storm subsided, but the rover kept silent even after the storm ended in early-October, suggesting either a catastrophic failure or a layer of dust covered its solar panels. The team remains hopeful that a windy period between November 2018 and January 2019 may clear the dust from its solar panels, as has happened