NASA and its international partners are set to receive scientific research samples and hardware as a SpaceX Dragon cargo spacecraft departs the International Space Station on Sunday, April 28 weather permitting. Dragon will undock from the station’s zenith port of the Harmony module at 1:05 p.m. and fire its thrusters to move a safe distance away from the Station after receiving a command from ground controllers at SpaceX in Hawthorne, California.