The gangly craft is capable of flying perpetually, thanks to 17,000 solar panels that charge a 633 kilogram (2,077 pound) lithium battery, which then powers the craft at night. The only thing that prevents a non-stop flight is the crew, which need to restock on supplies and drop off waste materials every few days. With an 88 mph cruise speed, the pilots should arrive back in Abu Dhabi in early August if everything goes to plan. So far, the team has picked up five world records for solar-powered flight, including, ironically, three at night. But as Piccard and Borschberg elaborate in the video below, all of that is just prelude to the round-the-world attempt happening in just over a month.