[20] Varian, Varian GaAs Space Solar Cell Data Specification Sheet, from Varian Research Center, Palo Alto, CA. [21] Sparks, Douglas R,. (1988) Vacuum reduction of extraterrestrial silicates, Journal of Spacecraft and Rockets, March-April. [22] Jones, Jack A. & Blue, Gary D. (1988) Oxygen chemisorption compressor study for cryogenic Joule-Thomson refrigeration, Journal of Spacecraft and Rockets, May-June. [23] Jones, Jack A., Status of sorption cryogenic refrigeration, NASA tech brief, 12,8, Item No. 116. Dedication This paper is dedicated to the memory of Robert A. Heinlein, who was the source of our inspiration. Acknowledgements We would like to thank the following individuals for their help in the preparation of this paper: Dr John Lewis of the Center for the Utilization of Local Planetary Resources at the University of Arizona, Carolyn Meinel of Cardinal Communications, William Taylor of Pratt & Whitney, James R. French of JRF Engineering, Kevin McClung of McClung Consulting, Loren Brown of Rocketdyne, and Paul Szymanski, Jim Bennet, and George Koopman of American Rocket.
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