Curiosity isn't NASA's only rover currently on Mars – the Opportunity has also been on the red planet since 2004. But last year, the planet and it's not been heard from since
The Opportunity rover is solar-powered, and the storm kicks up so much that the sun's rays are blocked from reaching the planet's surface and recharging its batteries. The rover has not responded to contact from Earth, and over the last seven months ignored over 600 calls, leading the NASA team to believe that it can no longer be able to continue its mission.
It was hoped that as the storm cleared, the wind would blow away the dust which covered the rover's solar panels so the rover could recharge. But this has not happened, and the rover remains silent. NASA has been attempting to contact the rover through a strategy called "sweep and beep," where rather than just listening for responses from Opportunity, they send commands to the rover to respond with a beep, but they have been unsuccessful so far. ] Now NASA scientists are trying to connect to the rover based on three unlikely but possible scenarios: that the rover's primary X-band radio has failed, that both the primary and secondary X-band radios have failed, or that the rover's internal clock has become offset. The team is commanding the rover to switch to its backup X-band radio and to reset its clock to counteract these possibilities.
"We have not heard back from the rover and the probability that we will ever be decreasing each day, we plan to continue to pursue every logical solution that could put us back in touch, ”John Callas, project manager for Opportunity at NASA's Jet Propulsion Lab, said in a statement.
These strategies are becoming urgent due to the seasonal changes on Mars. The season of high winds which could clear the dust from Opportunity's solar panels is coming to an end and soon south winter will be arriving, which means very low temperatures that are likely to cause irreparable damage to the rover's systems. NASA will try sending the new commands for several weeks, but if the Opportunity doesn't respond this time, then it's likely that the mission will have to be abandoned.