Last month, Space X’s CRS-7 exploded after take-off. I was 4 miles from the launchpad that morning, but there wasn’t much news that day as to what had failed on the Falcon 9 rocket. Today, there’s more news. Here’s Loren Grush’s at The Verge:
The SpaceX explosion on June 28th was caused by a failed strut in the rocket’s upper stage liquid oxygen tank, SpaceX chief executive officer Elon Musk said today. The strut was one of several hundred used to hold together the helium pressure vessels in the tank, which help to pressurize and maintain the buoyancy of the rocket. According to Musk, the strut was designed to handle 10,000 pounds of force, but failed at just 2,000 pounds of force.