Falcon 9 rocket at the launch pad

In the next few days, Dragon’s sensors and flight systems are subjected to a series of complicated tests to determine if the vehicle is ready to berth with the space station. These tests include maneuvers and systems checks in which the vehicle comes within 1.5 miles of the station. NASA will then decide if Dragon is allowed to attempt berthing with the station. If so, Dragon approaches, is captured by station’s robotic arm, and attached to the station, a feat that requires extreme precision.

See more photos of SpaceX's launch preparations.