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Dragon Spacecraft Qualification Unit
The Dragon Spacecraft Qualification Unit was a boilerplate version of the Dragon spacecraft manufactured by SpaceX, a space transportation company in Hawthorne, California. After using it for ground tests to rate Dragon's shape and mass in various tests, SpaceX launched it into low-Earth orbit on the maiden flight of the Falcon 9 rocket, on June 4, 2010. SpaceX used the launch to evaluate the aerodynamic conditions on the spacecraft and performance of the carrier rocket in a real-world launch scenario, ahead of Dragon flights for NASA under the Commercial Orbital Transportation Services program. The spacecraft orbited the Earth over 300 times before decaying from orbit and reentering the atmosphere on 29 June.〔
== Delays ==
In September 2009, the launch was expected to occur no earlier than November 29, 2009,〔 however the launch was subsequently postponed ten more times, to launch dates in February, March, April, May, and June 2010,〔 for multiple reasons including finding an open launch date, approvals, and retesting. The launch date was eventually set for June 4, 2010.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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