The SpaceX Falcon rocket and Dragon spacecraft took off at 4:47 AM Saturday morning to deliver supplies to the International Space Station. But Elon Musk's latest tweets suggest the test of SpaceX ...

Video showed the upper stage of the most powerful rocket ever built spinning out of control in space, a repeat of an unsuccessful test flight in January that led to debris falling over the Caribbean.

“It’s almost unheard of for a private rocket company to launch successfully to orbit the first time,” he said. “Whether we make it off the pad, reach max Q, or get all the way to ...