Ultra-high precision photometry of open clusters: A study of stellar activity in old stars

Ultra-High Resolution Observations of the Upper Chromosphere: First Results From the NRL VAULT Sounding Rocket Payload

Ultra-High Resolution Studies of AGNs II:, 3C279 Proper Motion

Ultra-High Resolution Studies of AGNs III: nuclear extent and the SIM astrometric grid

Ultra-Kreepy Melt Rocks, Ree-Rich Norites and a Diverse Suite of Clasts from Apollo 16 Breccias

Ultra-lightweight 4-meter segmented composite mirrors for extremely large telescopes

Ultra-low phase noise 10 GHz oscillator to pump the parametric transducers of the Mario Schenberg gravitational wave detector

Ultra-low temperature cryogen-free refrigerator

Ultra-low-frequency waves in the Jovian magnetosphere: causes and consequences

Ultra-low-noise 1.2- to 1.7-GHz cooled GaAsFET amplifiers

Ultra-luminous infrared galaxies: far-infrared spectral energy distributions

Ultra-Precision Linear Actuator for optical systems

Ultra-primitive interplanetary dust particles from the comet 26P/Grigg-Skjellerup dust stream collection

Ultra-relativistic electrons in Jupiter's radiation belts

Ultra-Stable Crystal and Rubidium Oscillators for Space Applications

Ultra-thin multi-element Si pin photodiode arrays for medical imaging applications

Ultra-Violet Absorption in Living and Dead Cells

Ultrabass Sounds of the Giant Star xi Hya

Ultracompact H II regions: are their lifetimes extended by dense, warm environments?

Ultracompact HII Regions in the Magellanic Clouds