UBVI CCD photometry and star counts in 9 inner disk Galactic star clusters
UHECR propagation in the Galactic Magnetic Field
UKIRT follow-up observations of the old open cluster FSR0358 (Kirkpatrick1)
ULAS J141623.94$ + $134836.3 - a faint common proper motion companion of a nearby L dwarf. Serendipitous discovery of a cool brown dwarf in UKIDSS DR6
Ultra- and Hyper-compact HII regions at 20 GHz
Ultra-cool Dwarfs from Large Area Surveys
Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
Ultra-fine dark matter structure in the Solar neighbourhood
Ultraluminous X-ray Source Correlations with Star-Forming Regions
Ultraluminous X-ray Sources in Interacting Galaxies
Ultraviolet Continuum Color Variability of Luminous Sloan Digital Sky Survey QSOs
Ultraviolet Spectroscopy of Circumnuclear Star Clusters in M83
Uncloaking globular clusters in the inner Galaxy
Uncovering the kiloparsec-scale stellar ring of NGC5128
Uncovering the Origins of Spiral Structure by Measuring Radial Variation in Pattern Speeds
Understanding and reducing statistical uncertainties in nebular abundance determinations
Understanding Global Galactic Star Formation
Understanding local Dwarf Spheroidals and their scaling relations under MOdified Newtonian Dynamics
Understanding Mass-Loss and the late Evolution of Intermediate Mass Stars: Jets, Disks, Binarity, Dust and Magnetic Fields
Understanding of the role of magnetic fields: Galactic perspective