development. Based upon this report's development plan, the first launch vehicle developments for any large scale power satellites would be in the 2005-2010. The first satellite would be launched in 2035-2040. Because of long time until the first vehicle flight, it would be unwise to select a specific technology or set of technologies for the transportation system. Also, the specific architecture of the space solar power system will determine the relative importance of the transportation technologies. If a large scale power system is required, the need for lunar resources may become crucial. On the other hand, a smaller satellite constell ation would most likely not use extraterrestrial-based resources. The propulsion technologies that would be used would be advances reflecting the potential of Single Stage to Orbit and other improvements in propulsion technology to increase the energy density of propellants (such as metallized propellants and high energy density propellants). Light weight or high temperature materials will also play a vital role in reducing the cost of space operations and space access. Only time will tell how ambitious and exciting our global technological future will be in space transportation. References Koelle Dietrich (1992) Beta II, single stage to orbit, ISTS conference Kagoshima 1992. Heald Daniel (1991) Single Stage To Orbit Vertical Takeoff and Landing Technology Challenges, IAF congress 1991 in Montreal. Gryaznov, G., “Topaz Optimal Source of Electrical Energy for Advanced Civil Space Applications,” SPS 91, 1991. Isakowitz, S, “International Reference Guide to Space Launch Systems”, AIAA, 1991. Palaszewski, B., “Atomic Hydrogen As A Launch Vehicle Propellant,” AIAA Paper 90-0715, January 1990. Palaszewski, B., “Electric Propulsion for Lunar Exploration and Lunar Base Development,” 2nd Symposium on Lunar Bases and Space Activities in the 21st Century, LBS-005, April 1988. Palaszewski, B., “Launch Vehicle Performance Using Metallized Propellants,” AIAA Paper 91-2050, June 1991. Anon., “Big Dumb Boosters: A Low Cost Space Transportation Option?,” United States Office of Technology Assessment, Background Paper, No number, February 1989. Reichert Michael, Conditions for economic benefit by using lunar oxygen for Earth-Moon transportation systems, IAA -92-0157, IAF Congress Washington DC, 1992.
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