In order to measure the density of the Universe, it is necessary to sample a region that is larger than the scale on which the Universe becomes approximately homogeneous. ... When applied to clusters of galaxies we find a mass to luminosity ratio that implies a density of the Universe that is about 0.3 times the critical density. ... Thus the mass-to-muinosity ratio appears to vary with the size of the region measured, from 3 in the solar neighborhood to 30 in galaxies to 300 in clusters of galaxies. ...

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• Introduction
• H I and dynamical mass
• The very metal-poor local dwarf galaxies

... We consider the astrophysical evolution of the Galaxy over large time scales, from early stages (an age of ~10 8 yrs) to the end of traditional stellar evolution (~10 11 yrs). ... In the model considered, the basic stages of Galactic evolution are as follows. ... Essentially all other basic parameters of the Galaxy vary little. ... The final "stellar epoch" in the life of the Galaxy is completed ~10 13 yrs after its formation, when the evolution of the least massive stars comes to an end. ...

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... Telescopes . ... The International Conference "Dark Ages and White Nights (Spectroscopy of the CMB)" (June 20-24, 2016) . ... The International Conference "Stars: from collapse to collapse" (October 3-7, 2016) . The traditional annual competition conference of scientific and scientific-engineering papers of the Observatory staff members . ... A session of the Dissertation Council (October 16, 2015) . ... International scientific conference "Large Optical Telescopes" (October, 10-13, 2011) . ...

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• Large telescopes application form
• Total Solar Eclipse of 2008 August 1
• Solar system sector, archive 2006

... Planets . ... Stars . Exoplanets . ... Most exoplanets so far discovered fall into the category of тАШhot JupitersтАЩ, these are giant planets orbiting very close to their parent star. ... Note that we have discovered so many hot Jupiters because they are the easiest type of planet to find, they are not necessarily particularly common in the galaxy. ... Subsequently several similar hot and?а fuzzy worlds have been discovered the same way, proving this that this planet is not a one-off oddball. ...

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• Kepler-11: a strange and crowded planetary system | Astronotes
• Vesta: Asteroid seen by Dawn spacecraft | Astronotes
• How to see exoplanets! | Astronotes

... Transient large-scale chains of August 22, 1996 in four SOHO/EIT channels. At least two large scale chains go from the active zone 1 near the S-E limb where the 1N/C4.5 LDE event , long-duration two-component microwave GRF burst , and the large loop-like CME took place several hours before. ... Large-scale chains of August 22, 1996 in EUV, soft X-ray and microwave ranges. ... A modified SOHO/EIT movie at 195 A showing the evolution of the EUV large-scale chains during August 21-23, 1996. ...

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• LARGE-SCALE PHENOMENA AT THE SUN ASSOCIATED
• Large_Scale Emitting Chains
• CMEs and Space Weather

. INFRARED PROCESSING AND ANALYSIS CENTER

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• Optical System
• Mechanics and Cryogenics
• Saturn's Moon Epimetheus

. July 14 . November 8 . Previous slide . Next slide . Back to first slide . View graphic version .

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• Description
• Return largest true index of a logical vector

... Creation of Space transportation system on the base of large length rope utilization . ... A given address contains the proposal to equip the International Space Station with the long rope and to create on that base a Space transportation system. ... A given system has the multifunctional purpose. ... The rope system could be the base for creating of alternative system of station angular orientation. To utilize the rope system to launch small satellites from the station and to return them back. ...

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• Mass Measurements aboard Space Station Skylab
• Comparing Masses Without Use of Gravity
• The Sun -- History

я?? . Publi?й le 18/08/2008 par Olivier Staiger . Date : 01/08/2008 . Lieu : Mer de Barents au large de Novaya Zemlya , sur un brise-glace . Coordonn?йes GPS : environ 75.9 N , 54.9 E . Mat?йriel de prise de vue : Canon EOS 450D , optique Sigma 400mm / 5.6 , sans tr?йpied ( ?а la main ) . Commentaires : 800 ASA , 1/3000 sec. , F 5.6

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• http://www.cieletespace.fr/node/10913?thickbox=1&width=800&id=10900
• http://www.cieletespace.fr/node/11004?thickbox=1&width=800&id=10900
• Plan large sur la Lagune | Ciel et Espace

... Submitted by Al Takeda on 08/19/2007 21:04:50 . NGC 6992 (Veil Nebula ? ?eastern region?) . NGC 6992 (Veil Nebula ? ?eastern region?) ? A 2.6 degree diameter supernova remnant in Cygnus. While the Veil can be seen with a 7x50 binoculars in dark skies the filamentary structure can only be seen visually with a large scope of 25 inches or larger. ... 9 August 2007. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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... If you arrive by train: . ... Trains from Moscow, other Russian cities to the south and south-east of St. Petersburg arrive at the Moskovskii vokzal, linked to the metro station Ploshchad' Vosstaniya. ... Domestic and some international flights arrive at the Pulkovo-1 terminal, from where one can reach the Moskovskaya metro station by bus No. 39 or "marshrutka" (routed shared taxi, express minibus) No. ... Location of Pulkovo Observatory (map) : . ... Location of the Workshop : . ... Copyright 2014....

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Imaging with the GLAST Large Area Telescope ' J. Chiang JSM , 1 August 2007 $ 1 Imaging Using the GLAST Large - Area Telescop e Jim Chiang Stanford Linear Accelerator Center % Imaging with the GLAST Large Area Telescope ' J. Chiang JSM , 1 August 2007 $ 2 The GLAST Large Area Telescop e % Imaging with the ... Distinguishing a collection of weak point sources from diffuse, extended emission. ...

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• http://hea-www.harvard.edu/~pgreen/SOC/9.html
• Chandra Images for SNR J0047.5-7307
• Chandra Images for SNR J0047.2-7308

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... This energy, as I'll show in a moment, comes from a tiny loss of mass in the Sun. ... In the Sun's core, it converts hydrogen into helium by nuclear fusion. ... The total mass converted to energy is a whopping 2 billion kilograms (4.4 billion pounds) every second! But , the Sun has a total of 2 x 10 30 kilograms of mass, or a trillion billion times as much as it converts to energy every second. ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Misconceptions: The Planet X Arguments in a...

... Over the first 4 years, its X-ray telescopes eROSITA and ART-XC will survey the whole sky with a record sensitivity in the 0.5-10 keV energy band. ... The goal of the second international Spectrum-RG conference is to discuss the different scientific topics addressed by the mission, synergies with surveys at other wavelengths, and requirements to follow-up observations.Contributed talks and poster presentations are invited on the topics related to the SRG science goals. ... Active galactic nuclei . ...

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• Spectrum-Roentgen-Gamma - The astrophysical Project at IKI RAN
• z90-program
• RTT150 Technical Description

The small solids. Asteroids or the small planetes . ... The comets. ... Ceneca the Young.Procuring about the nature.63 y. The comet is a celestial body of a great size, but a rare one... transparent. Sometimes there seen a core and the medium forms a kind of a tail, beard or dishevelled looks. ... The core is an ice body - conglomeration of frosted gas and dust. ... The comet state is variable: ones have the con tails, others the dust tails, and the third have both. ... Meteors and meteorites. ...

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• merkurie

When using a large number of Virtual Hosts, Apache may run out of available file descriptors (sometimes called file handles if each Virtual Host specifies different log files. ... Unix operating systems limit the number of file descriptors that may be used by a process; the limit is typically 64, and may usually be increased up to a large hard-limit. ... If you system falls into 1 or 2 (above), then increase the file descriptor limit before starting Apache, using a script like #!/bin/sh . ...

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... Previous: Multi-threaded Query Agent and Engine for a Very Large Astronomical Database . ... Dedicated tools have been developed at CDS in order to face the challenge of fast on-line access to very large astronomical catalogues. ... When a query to such a large catalogue is submitted to VizieR , the CDS database of catalogues and tables (Ochsenbein et al. 2000), a dedicated program handles the request, extracts and decodes the matching data, and sends its output back to VizieR. ... 1990, Russel et...

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• ADASS 2003 Conference Proceedings
• Parallel Tree N-body Code: Data Distribution and DLB on the CRAY T3D for Large
• The Role of the CDS Information Hub in the Cross-identification of Large...

... 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. ...

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• Urban Lunar Eclipses ? Amateur Astronomers Association of New York
• Total Lunar Eclipse ? September 27, 2015 ? Amateur Astronomers Association of

... Dnepr launch record 17 August 2011. Cluster Launch of Dnepr LV 22 August 2013 KOMPSAT-5 Launch 21 November 2013. Dnepr Cluster Mission 2013 19 June 2014. ... Mission profile SHM configuration Reliability Dnepr LV Performance Launch Sites . ... The launch vehicle is steam ejected from its Transport and Launch Canister (TLC) by means of hot gases of black powder gas generator. ... Activation of black powder gas generator . ... Separation of black powder gas generator . ... Dnepr LV Performance . ...

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In the conference room on October 28th: . click on the thumbnail photos to see larger size ones) . At the conference room on February 1st: . ... After the official part on February 2nd: . ... At the plenary session on August 6th: . At the regular and poster sessions on August 9th: . After all in working room on August 12th: . ...

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• Database of Optical Properties -- Level: subpage
• Modelling the Milky Way in the Era of Gaia - JD5 programme
• Milanova Kholtygin, PAZH (2006)