were in SpaceX’s Dragon capsule as the company’s Falcon 9 rocket took them to the first-ever polar orbit by humans. The 4.5-hour launch window opened at 9:46 p.m. ET and it took off from ...

A few hours before launch, officials said a problem with a hydraulic system that feeds into one of the clamp arms on the transporter erector, which holds down the rocket before liftoff.