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During a news conference Tuesday (April 20) Steve Stitch, manager of NASA's Commercial Crew Program, said SpaceX's third astronaut launch in under a year was "go for launch" on Thursday, following a launch readiness review.
For the first time, NASA is putting its trust in a recycled SpaceX rocket and capsule for a crew.
The rocket was used to launch the current station crew last November from NASA's Kennedy Space Center.
The capsule, dubbed Endeavour, also will be making a repeat performance; it carried two test pilots to the space station on SpaceX's first crew flight last spring.
The crew of four - NASA's Shane Kimbrough and Megan McArthur, France's Thomas Pesquet and Japan's Akihiko Hoshide - will journey to the International Space Station following a dawn liftoff from Florida's Cape Canaveral.
They will spend six months at the orbiting lab, replacing another SpaceX crew that's close to coming home.