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``Fifteen Years of Commercial Space in Retrospect''
21st Century Earth Observing Systems: Emerging Role for Spaceports
A Coherent Vision for Space Exploration and Development in the 21st Century
A Comparison of Alternative Methods for the Mars Sample Return Mission
A comparison of measurements and predictions for the April 15 and April 18, 2001 solar proton events
A Concept for Robotic Lunar South Pole Exploration
A Concept of Driving on Orbital Station
Adaptive Vectored Thrust Deorbiting of Space Debris