Elon Musk says SpaceX finally knows what caused the latest rocket failure

SpaceX CEO Elon Musk says that his company has finally gotten to the bottom of the September 1st Falcon 9 explosion — claiming it was the “toughest puzzle” they’ve ever had to solve. And now that the problem is known, he expects SpaceX to return to flight in mid-December.
Speaking on CNBC yesterday, Musk said “it basically involves liquid helium, advanced carbon fiber composites, and solid oxygen. Oxygen so cold that it actually enters solid phase.”
“Oxy