... We have used a coupled dynamical and chemical model to examine the chemical changes caused by the passage of a density wave propagating into the protostellar cloud. ... The chemical coupling between gas and dust causes locally increased number densities of active ra dicals, such as C, N, O, NH, and OH, and hydrogen saturated molecules CH 4 , NH 3 and H 2 O. We show that chemical evolution in the post-wave gas can account for the observed abundance of water and NH 3 observed in interstellar clouds. ...

... IAU planet classification Observing with a Telescope Large Scale Structure The observables: Local Group (size 1 Mpc) Virgo cluster (size 2+ Mpc) Virgo supercluster (size ~33 Mpc) Voids (size ~ 10-150 Mpc), Walls and sheets, aka filaments (size ~ 50-80+ Mpc) 1 parsec The nearest star is 1.2 parsecs away (Proxima Centuri). ... Virgo supercluster Voids, Sheets Filaments The Virgo Cluster is a cluster of galaxies at a distance of about 18.0 Mpc away in the constellation Virgo. ...

АНОНС НАУЧНЫХ КОНФЕРЕНЦИЙ 1998-99 гг. ... An AAS Electronic Announcement Dear Colleague: NASA has approved development of a Wide Field Camera 3 (WFC3) for installation in the HST on the 2002 Servicing Mission. A Scientific Oversight Committee (SOC) is being established to ensure that the broad interests of the scientific community are represented in the development of WFC3. The primary task of the SOC will be to advise the HST Project and STScI in all areas of scientific performance of WFC3. ...

STARTEST IMAGES GALLERY . STARTESTING TELESCOPES WITH AN AUTOCOLLIMATOR . ... This website is a joint effort of Markus Ludes from APM-Telescopes and Cor Berrevoets ( Aberrator free startesting Software ). The site aims at explaining the different aspects of star-testing telescopes. ... Markus Ludes (APM telescopes) used a high quality 10" Maksutov Newtonian (Zygo tested at 632,8 nm with the following errors: 1/10.1 wavefront p.t.v. and 1/51 wavefront RMS) as collimator in single pass scheme. ...

... Some changes concerning conference fee and social program were caused by financial instability. The Conference Fee is deducted to 200 Euro for foreign participants and includes issue of Official Invitation Letter approved by Russian Emigration Authorities, coffee-breaks and abstract and program books. The reduced Conference Fee is deducted to 1500 Russian rubles for participants from Russia and includes coffee-breaks and abstract and program books. ...

Microsymposium 38, MS082, 2003 (A4 format) EVALUATING THE STRUCTURE OF THE SURFACE LAYER OF MERCURY. ... Photometric Analysis of the Lunar Surface Analogue. ... The phase function obtained directly on some segments of the lunar surface: 1- phase function of the Moon, 2 - phase function of Mercury, 3 - phase function of segments, converted to the lunar phase function system (correlation 0.8), 4 - phase function of segments, converted to the Mercurian phase function (correlation 0.9). ...

... Full silvery Moon illuminates terrain. ... Begun a next moon eclipse, when Land barriers a Moon from the Sun and throws its shade on it. ... Drawing 1. ... Drawing 6 Drawing 6 shows a splendid photo of full moon eclipse 18-19 november 1975 during is packed phases doing Dennis de Chikko. ... Eclipse, which will occur 9 november 2003, is a repetition through сарос (cycle of repetitions of eclipses equal 6585 days or 18 years 11 days) full moon eclipse from 28 octobers 1985 with the maximum phase 1,07....