SpaceX says it has identified and fixed the problem that caused its Falcon 9 rocket

That failure occurred on July 11, as a Falcon 9 carried 20 of SpaceX’s Starlink broadband satellites toward low Earth orbit. The rocket’s first stage performed normally that day, but its upper stage sprang a leak of liquid oxygen, which prevented it from conducting an orbit-raising burn as planned; the Starlink satellites were deployed too low as a result and came back down to Earth in relatively short order, burning up in our planet’s thick atmosphere.

The cause of the leak is a mystery no longer. It resulted from “a crack in a sense line for a pressure sensor attached to the vehicle’s oxygen system,” SpaceX announced in an update on Thursday afternoon (July 25). “This line cracked due to fatigue caused by high loading from engine vibration and looseness in the clamp that normally constrains the line.”