NASA preps stadium-size sandwich bag launch

Mighty polyethylene orb eyes ultra-long flight record NASA is gearing up for the fourth launch of its high-altitude, heavy-lift super pressure balloon (SPB) tech, which involves hosting a 1,025kg payload aloft under a helium-filled "pumpkin-shaped, football stadium-size balloon" crafted from "22-acres of polyethylene film - similar to a sandwich bag, but stronger".…