After leaving its crew behind, Boeing’s troubled Starliner makes safe return to Earth

Leaving its crew behind in orbit, Boeing’s troubled Starliner spacecraft undocked from the International Space Station Friday and chalked up a successful unpiloted return to Earth, closing out a disappointing test flight with an on-target New Mexico touchdown.  Despite NASA’s concerns about earlier thruster problems and multiple helium leaks in the ship’s propulsion pressurization system,

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