Blue Origin is investigating why a rocket engine exploded during testing

Jeff Bezos' Blue Origin is still running into technical problems. The company has confirmed that a BE-4 engine exploded roughly 10 seconds into a firing test in Texas on June 30th. No one was hurt during the incident, but CNBCunderstands the engine was supposed to be sent to United Launch Alliance (ULA) for use in its second Vulcan rocket flight. An investigation is still underway. Blue Origin says it has a "proximate cause" for the explosion, and is working on unspecified "remedial actions." Th...