SpaceX CRS-15

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Packed with more than 5,900 pounds of research, supplies and hardware, the SpaceX Dragon spacecraft will launch on a Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida.

About 10 minutes after launch, Dragon reaches its preliminary orbit, at which point it will deploy its solar arrays and begin a carefully choreographed series of thruster firings to reach the International Space Station.

In addition to bringing research to station, the Dragon’s unpressurized trunk is carrying a new Canadian-built Latching End Effector, or LEE. This new LEE is being launched as a spare to replace the failed unit astronauts removed during a series of spacewalks in the fall of 2017. Each end of the Canadarm2 robotic arm has an identical LEE, and they are used as the “hands” that grapple payloads and visiting cargo spaceships. They also enable Canadarm2 to “walk” to different locations on the orbiting outpost, including Canada’s Mobile Base, which travels along rails on the space station’s main truss.
AI, Cancer Therapy and Chemical Gardens on SpaceX Dragon to Station | NASA