Roman Ponca spent an hour on his back in the Patagonian grass, camera rolling on a timelapse, while a cougar watched him from a distance. That shot never made the final cut of "Edge of the Sky." The shot that did is a single continuous timelapse from two 360-degree cameras strapped to a weather balloon, climbing through cloud layer after cloud layer until nothing is left in the frame but the Blue Marble. It's the moment audiences bring up first, almost every time. "Edge of th