While SpaceX has sent plenty of cargo Dragons to the space station, crew Dragon is a different beast. It docked autonomously under the station astronauts’ watchful eyes, instead of relying on the station’s robot arm for berthing. The capsule’s nose cap was wide open like a dragon’s mouth, to expose the docking mechanism. Behnken said that’s the way it should work when he and Hurley are on board; they may push a button or two and will have the ability to intervene, if necessary. As part of Sunday’s shakedown, the station astronauts sent commands for the Dragon to retreat and...