Mon. Not. R. Astron. Soc. 349, 1397­1418 (2004) doi:10.1111/j.1365-2966.2004.07619.x The 2dF QSO Redshift Survey ­ XII. The spectroscopic catalogue and luminosity function S. M. Croom,1 R. J. Smith,2 B. J. Boyle,1 T. Shanks,3 L. Miller,4 P. J. Outram3 and N. S. Loaring4,5 1 2 3 4 5 Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD Department of Physics, University of

... Pulkovo Astrometric Observations of Bodies in the Solar System from 1898 to 2005: Observational Database T. P. Kiseleva and E. V. Khrutskaya Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. ... The long-term work resulted in long, homogeneous series of observations of various bodies in the Solar System: Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto; the satellites of Mars, Jupiter, and Saturn; selected minor planets, asteroids, and comets. ... 2001; Kiseleva et al...

... Three energetic mechanisms are considered: multiple supernova explosions (SNe), a hypernova explosion associated with a gamma ray burst (GRB), and the vertical impact of a high velocity cloud (HVC). ... As a consequence, multiple SNe form rings with a high ring-to-center contrast K < 100 in the HI column density, whereas single hypernova explosions form rings with K < 10. ... Our simulations show (see Fig. 6) that both multiple SNe and single hypernovae may form rings of up to 2 kpc in diameter. ...