As Joe Kittinger found out in 1960, it’s hard to jump from a height of 102,800 feet—let alone in an open gondola, in minus 100 F temperatures, wearing 160 pounds of equipment—and survive. As Michele Fournier reaffirmed this weekend on an airfield in Saskatchewan, it’s even more difficult to break that 50-year-old record for the highest free fall. The French parachutist attempted, for the fourth time, to rise to a height of 130,000 feet in a pressurized capsule dangling beneath a high-altitude air balloon, then step out of it and hurtle toward Earth at supersonic speed, breaking the sound barrier....