NASA is holding out hope that its Opportunity rover will make a full recovery as it hunkers through one of the most powerful dust storms ever witnessed on Mars, NPR reports. The storm (pictured), which began on 10 June and covers more than 35 million square kilometers, has blocked out the sunlight, throwing Opportunity into a perpetual nightfall until it blows over. The 15-year-old rover, which has fallen asleep because of low solar energy, will rely on martian winds to clear off its solar panels to begin recharging. However, in a teleconference today, NASA said it is confident that the rover will rally through. Meanwhile, the agency will use this storm as a chance to learn more about conditions on Mars.