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June 15, 2011
Astronauts Eileen M. Collins, mission commander; and Jeffrey S. Ashby, pilot, peruse checklists on Columbia's middeck. Collins and Ashby were joined by three mission specialists for almost five days in Earth orbit. The busiest of those days was the first, during which they released into space the world's most powerful X-Ray telescope and initiated a number of in-cabin experiments.

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