O AN Apparent Displacement of the Meridian as a Function of the Lunar Hour Angle
O AN Interplanetary Magnetic Field
O and H diffusion in uraninite: Implications for fluid-uraninite interactions, nuclear waste disposal, and nuclear forensics
O and H stable isotope compositions of oceanic crust and upper mantle rocks exposed in the Hess Deep near the Galapagos Triple Junction
O and Mg abundances in metal-poor halo stars and their implications for stellar Fe yields
O and N2 disturbances in the F region during the 20 November 2003 storm seen from TIMED/GUVI
O and Na abundance patterns in open clusters of the Galactic disk
O and Ne in an H-He Fast Solar Wind
O and Ne K absorption edge structures and interstellar abundance towards Cyg X-2
O and S isotopic composition of dissolved and attached oxidation products of pyrite by Acidithiobacillus ferrooxidans: Comparison with abiotic oxidations
O and Wolf-Rayet Stars as X-Ray Sources
O and α-Element Abundances in Metal-Poor Stars
o And: A New Active Episode?
o And: another major shell phase just coming?
O And: Confirmation of a New Emission-Line Episode
o And: polarization observations of 1982 april evince the recent shell episode
O Andromedae
O Andromedae
O Anomalies in Interstellar Dust Size Fractions
O astronomical refraction near the horizon