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Sources
  • "Advanced Space Transportation Program: Paving the Highway to Space." NASA. (July 23, 2010)http://www.nasa.gov/centers/marshall/news/background/facts/astp.html_prt.htm
  • Attenborough, Stephen. Personal interview. Conducted 7/28/2010
  • Boyle, Alan. "What's the cost of the space station?" MSNBC. Aug. 25, 2006. (July 23, 2010)http://www.msnbc.msn.com/id/14505278/
  • Virgin Galactic. 2010. (July 23, 2010)http://www.virgingalactic.com/
  • Whitesides, George. Personal interview. Conducted 7/29/2010.