In an article(opens in new tab) published on Monday (May 23), the website Space Explored alleged that Endeavour experienced an issue during its mission that could have had disastrous consequences during last month's homecoming...citing unnamed sources at NASA and SpaceX, claims that hypergolic propellant — fuels paired to instantly combust on contact — leaked into Endeavour's heat shield during the mission. (Dragon's Draco thrusters use hypergolic propellants.) NASA...has issued a statement refuting the heat shield claims... Steve Stich, manager for NASA's Commercial Crew Program, took some time to comment on the Crew-5 heat shield swap. Stich elaborated on the testing...