international space station
During the time after its departure, the spacecraft deployed four cubesats and performed a fire experiment.
SpaceX said the test was a success, setting the stage for a launch late Thursday of a Dragon cargo spacecraft to the International Space Station.
Currently, the station is in direct contact with Russia only when passing over Russian ground stations, relying on NASA the rest of the time.
Astronauts Peggy Whitson and Jack Fischer were set to begin the six-and-a-half-hour spacewalk around 8 a.m. Eastern, but the start has been delayed by small water leak in an airlock umbilical line.
The Multi-Purpose Laboratory Module, also known as Nauka, was originally set to be added to the ISS in 2007.
The Dragon, flying the CRS-10 cargo mission, splashed down in the Pacific Ocean southwest of Long Beach, California.
The walk took six and a half hours to swap out old batteries used by the station's power system.