The atmosphere is <i>really</i> thin at 65k feet.<p>Considering the solar impulse was only able to achieve 36 hours aloft, and has a service ceiling of 39,000 feet, it is going to take a lot of technical and material breakthroughs for these drones to operate at 65k feet for months.<p>Not impossible, but people should realize that this will realistically be launched in something like 2025 or 2030, not 2016.<p>Of course, come 2025, the world may not need to have the internet blanketed on it by drones.