... Four types of galaxy environments are considered: clusters, centers of groups, other places in groups, and the field. ... In order to check whether the mean ages of the stellar populations depend on environment density monotonically, as the hierarchical par­ adigm predicts, in this work I consider four types of environment separately: the cluster galaxies, the brightest (central ) galaxies of groups, the second­ranked group members, and the field galaxies. ... Group center SB(rs)0# 204 637 1996 Oct ...

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

... Mr. Lee. ... This oral history with John Lee is being conducted for the Johnson Space Center Oral History Project in Houston, Texas. ... It is a complete history from the time that the group left California until the end of the war. ... One is in the JSC Library, and one is in the Clear Lake City-County Freeman Library. ... We had essentially designed the spacecraft at that time. ... One day, I got a phone call from one of the subsystem managers asking me, ?John, you said you wanted us to do this. ...

... Bad Astronomy . Misconceptions . ... Bitesize Astronomy . ... The Nine Planets . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... As I say on the page about orbits , at a year away Planet X must be roughly as far as Saturn (and therefore closer as you read this page). The distance from Earth in May 2002 should be about 900 million kilometers. ... Planet X, if it orbits on an ellipse, can get as far as 235 AU away, 7 times the distance of Pluto. ... 2008 Phil Plait. ...