O & B stars uvby-Hβ photometry. I. (Kaltcheva+, 1999)
O & B stars uvby-Hβ photometry. II. (Kaltcheva+, 1999)
O & B stars uvby-Hβ photometry. III. (Kaltcheva+, 2000)
O 18 / O 16 of feldspars in carbonate rocks
O 18 /O 16 ratios of some chondritic meteorites and terrestrial ultramafic rocks
O 2/O 3 Microatmospheres in the Surface of Ganymede
O 7774 A diagnostic for quiescent prominences
O a comet near the South Pole
O a new period of eclipses
O a Pitot-Tube Method of Upper-Atmosphere Measurements
O a remarkable phenomenon that occurs in total and annular eclipses of the sun
O a Self-Exciting Process in Magneto-Hydrodynamics
O a singular appearance during the solar eclipse, Nov. 1826
O a small variable star in Serpens
O acoplamento mecânico entre a antena e o transdutor no detector de ondas gravitacionais Mario Schenberg
O adsorption and incipient oxidation of the Mg(0001) surface
O algebraic notation
O Algoritmo usado no programa de criptografia PASME
O ambiente de binárias de pequena massa em formação: o caso do glóbulo cometário CG30 e IRAS08076-3556
O an ancient Eclipse observed in China