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Falcon 9
Falcon 9 is a family of two-stage-to-orbit launch vehicles designed and manufactured by SpaceX. The Falcon 9 versions are the Falcon 9 v1.0 (phased-out), Falcon 9 v1.1 (current version, expendable), and the Falcon 9-R (reusable launch system). Both stages of this two-stage-to-orbit vehicle are powered by rocket engines that burn liquid oxygen (LOX) and rocket-grade kerosene (RP-1) propellants. The current Falcon 9 (v1.1) can lift payloads of to low Earth orbit, and to geostationary transfer orbit. The three Falcon 9 versions are in the medium-lift range of launch systems.
The Falcon 9 and Dragon capsule combination won a Commercial Resupply Services (CRS) contract from NASA in 2008 to resupply the International Space Station (ISS) under the Commercial Orbital Transportation Services (COTS) program. The first commercial resupply mission to the International Space Station launched in October 2012. The initial version 1.0 design made a total of five flights before it was retired in 2013.
SpaceX is currently flying an improved and 60 percent heavier Falcon 9 launch vehicle—the Falcon 9 v1.1—which flew for the first time on a demonstration mission on the sixth overall launch of the Falcon 9 in September 2013.〔(【引用サイトリンク】url=http://www.cbsnews.com/video/watch/?id=50156088n )〕
The Falcon 9 v1.1 will be the base for the Falcon Heavy launch vehicle. Falcon 9 will also be human-rated for transporting NASA astronauts to the ISS as part of a Commercial Crew Transportation Capability contract.
== Development and production ==
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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