Utilization of lunar materials and expertise for large scale operations in space: Abstracts
Utilization of computer generated scenes of Apollo 15 landing site
US plant and radiation dosimetry experiments flown on the Soviet satellite Cosmos 1129
U.S. planetary protection program - Implementation highlights
Using the Shuttle for future advanced planetary missions
Using Lunar Module Shadows To Scale the Effects of Rocket Exhaust Plumes
Using gamma transmission to determine the shielding effectiveness of space vehicles
US experiments flown on the Soviet satellite COSMOS 936
Use of Martian resources in a Controlled Ecological Life Support System (CELSS)
Use of magnetic sails for advanced exploration missions
Use of lunar regolith as a substrate for plant growth
Use of Global Navigation Satellite Systems in Space
Use and Protection of GPS Sidelobe Signals for Enhanced Navigation Performance in High Earth Orbit
Uranus Probe Entry and Descent Mission Concept