U-Th zonation-dependent alpha-ejection in (U-Th)/He chronometry
U.S. Naval Observatory CCD parallaxes of faint stars. I - Program description and first results
UBV photometry of eclipsing binaries in the SMC
UBV photometry of HK survey stars (Preston+, 1991)
UBVRI aperture photometry of early-type galaxies
UBVRI photometry in cluster Tr 18 (Vazquez+, 1990)
UBVRIJHK color-temperature calibration (Worthey+, 2011)
UCB Algorithm for Exponential Distributions
UCD in the IVOA context
ULF Energy Transport Induced by Magnetospheric Boundary Oscillations
ULF Wave Activity in the Terrestrial Polar Cap and Polar Cap Boundary Regions as Observed by Cluster
ULF waves at comets Halley and Giacobini-Zinner - Comparison with simulations
ULTOR passive pose and position engine for spacecraft relative navigation
Ultra Low Temperature Ultra Low Power Instrument Packages for Planetary Surfaces
Ultra-Deep Chandra Observation of Galactic Oxygen-Rich Supernova Remnant G292.0+1.8: The First Images
Ultra-Deep MIPS Imaging of the Lockman Hole
Ultra-high brightness (greater than 10(exp 21) W/sq cm) laser facility
Ultra-high Dimensional Multiple Output Learning With Simultaneous Orthogonal Matching Pursuit: A Sure Screening Approach
Ultra-High-Intensity Lasers for Gravitational Wave Generation and Detection
Ultra-lightweight optics for laser communications