Ultrashort-Period Stellar Oscillations. III. Power-Spectrum Analysis of Photometric Observations of White Dwarfs

Ultrasoft Narrow-Line Seyfert 1 Galaxies and X-ray Surveys

Ultrasoft Narrow-line Seyfert 1 Galaxies: An Extreme of Accretion onto Supermassive Black Holes

Ultrasoft Narrow-Line Seyfert 1 galaxies: What physical parameter ultimately drives the structure and kinematics of their Broad Line Regions?

Ultrasoft narrow-line Seyfert 1s: At the extremes of Seyfert accretion?

Ultrasoft states of AGN.

Ultrasoft transient X-ray emission from AGN

ULTRASPEC: High-speed spectroscopy with zero readout noise

Ultrastatic spacetimes

Ultraviolet absorbers in the Venus clouds

Ultraviolet absorption by highly ionized atoms in the Orion Nebula

Ultraviolet absorption by highly ionized halo gas near the Galactic center

Ultraviolet absorption by interstellar gas at large distances from the galactic plane

Ultraviolet absorption by interstellar gas near 30 Doradus

Ultraviolet absorption by interstellar gas near the LMC star HD 36402 in the interstellar bubble N51D

Ultraviolet absorption lines associated with the VELA supernova remnant

Ultraviolet absorption observations of intermediate-velocity cloud gas detected towards the M 15 globular cluster

Ultraviolet Absorption of Refractory Elements by a Dual Laser Plasma Method

Ultraviolet Absorption Spectra of Some Early-Type Stars

Ultraviolet Absorption Spectrum of Air in the Region λλ 600-2000.