... 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 ...

... STAR FIELDS Newsletter of the Amateur Telescope Makers of Boston Including the Bond Astronomical Club Established in 1934 In the Interest of Telescope Making & Using Vol. ... 10 November 2013 This month we will be witness to a new comet ­ Comet ISON (C/2012 S1) and it has been billed as potentially the "comet of the century". ... I got the comet! ... Glenn's talk was entitled "Double Stars for Backyard Astronomers or Double Stars are Twice the Fun" Glenn has been an ATMoB member since April 1, 1980....

... This oral history session is being conducted with Hubert M. Drake as part of the NACA [National Advisory Committee for Aeronautics] Oral History Project sponsored by the NASA [National Aeronautics and Space Administration] Headquarters History Office. ... Drake: Okay. ... About that time, about the time the X-2 airplane was coming up into its flight test program, Bob Carman, one of our engineers, and I had considered what would be an extension program beyond the X-2?s performance of Mach three. ...

... New York Times r ecorded, "A thin, lum i1925 Solar Eclipse (cont'd on Page 4) Pit Stops in Space: Off-World Filling Stations WHAT IF?? ... January 2015 WHAT'S UP IN THE SKY AAA Observers' January Guide By Tony Faddoul The Winter Hexagon's Bright Stars Most of us are familiar with the stars of the famous Winter Triangle ­ Betelgeuse, Sirius, and Procyon ­ but, there is another asterism of bright stars visible from December through March. ... Sources: earthsky.org; space.com. ...