 Two astronauts in orbit say they're confident they can come back to Earth safely aboard their Boeing-built spacecraft called Starliner. The two have been aboard the International Space Station since early June. When they docked the Starliner, several of its thrusters unexpectedly shut down. Engineers are still investigating. NASA hasn't yet said when the two astronauts will return to Earth. I'm Corva Coleman, NPR News in Washington.