Transit of Mercury last four transits occurred on November 15, 1999; May 7, 2003; November 8, 2006; and May 9, 2016. The next will occur on November 11, 2019, and then on November 13, 2032. A typical transit lasts several hours. On June 3, 2014, the Mars rover "Curiosity" observed the planet Mercury transiting the Sun, marking the first time a planetary transit has been observed from a celestial body besides Earth. More generally, transits can also occur for Venus and were investigated in the context of searching for the hypothetical inner planet Vulcan. The most common observation to be made at a
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