The rocket's upper stage — known as Starship, or simply "Ship" — was supposed to deploy 10 dummy satellites into a suborbital trajectory and then splash down in the Indian Ocean about an hour ...

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.

Kelly, D-Ariz., a retired astronaut, had challenged Musk to climb into a rocket ship by the time the social media spat concluded on Friday afternoon. “Hey @ElonMusk, when you finally get the ...