... 2004 February 18 . Anvil Cloud Over Sicily . ... Appearing to float above a remote monastery in Sicily , Italy , the anvil cloud 's shape shows several classic cloud features. ... The dramatically flat cloud bottom is caused by temperature falling in the lower atmosphere -- above a specific height water-saturated air is forced to condense out water droplets. The shape of the cloud middle is caused by the water-droplet-laden column of air being blown both upward and to one side. ...

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• APOD: 2007 February 26 - A Rocket Debris Cloud Drifts
• APOD: 2016 February 14 - A Heart Shaped Lenticular Cloud
• APOD: 2013 February 27 - Asperatus Clouds Over New Zealand

... This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height. As water droplets grow , an opaque cloud forms. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. ... Resulting mammatus clouds can appear especially dramatic if sunlit from the side. ... Publications with keywords: clouds . ...

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• A Rocket Debris Cloud Drifts
• XWare > APOD
• Comet-like Clouds in the Cartwheel Galaxy

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Bad News

... Circumstellar disc of beta Pictoris: constraints on grain properties from polarization. To appear in the Astronomy & Astrophysics . abs , src , ps ] . ... Dust influx to Titan from Hyperion . ... abs ] . ... Characteristics of bulges and disks in interacting galaxies . ... Dust grains around Herbig Ae/Be stars: porous, cometary-like grains? ... To appear in the Astronomy & Astrophysics Supplement . ... Finally, Links may lead you to more options (e.g. via the LANL preprint system). ...

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... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 February 28 . The Sombrero Galaxy from VLT . ... FORS1 , VLT ANTU , ESO . ... Reasons include the Sombrero 's unusually large and extended central bulge of stars, and dark prominent dust lanes that appear in a disk that we see nearly edge-on. Billions of old stars cause the diffuse glow of the extended central bulge. ... About APOD | ...

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• APOD: February 22, 1999 - NGC 1316: After Galaxies Collide
• APOD: August 30, 1998 - The Sun Erupts
• LASG - Product specific information - TurboLinux

. Home . Documentation . Watchouts . Help . Calibration . Installation . Software requirements . Download . Notice that SOC-only packages like deceit, newsiam, odfcheck, etc , may appear listed in the list of all packages but no documentation is available for any of them. SAS User's Guide . HTML . PDF . PS . HEASARC ABC Guide (not up to date) . HTML . PDF . ps.gz . Pages maintained by SAS librarian . Any question about SAS should be addressed to the XMM-Newton help desk . Updated on: August 31, 2007

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• Using tasks

home publications > mercury . ... Astronomy Beat . ... Nearly four centuries ago, Galileo's simple observations of Earth's planetary sibling, Venus, buoyed the proponents of a Copernican universe. ... The Italian astronomer had settled into a new house in Florence and had begun to observe Venus, which in November 1610 would have appeared as an evening star, bright in the western sky after dusk. ... From these two observations, Galileo inferred that Venus must orbit closer to the Sun than does Earth. ...

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• ASP: Let Venus Be My Guide
• ASP: Contents, July/August 1996
• ASP: Editorial

.

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• Astronomy HyperText Book: Interstellar Medium
• Ozone Depletion

... The Pleiades star cluster, also known as the Seven Sisters and Messier 45, is a conspicuous object in the night sky with a prominent place in ancient mythology . ... The stars in the Pleiades are thought to have formed together around 100 million years ago, making them 1/50th the age of our sun, and they lie some 130 parsecs (425 light years ) away. ... Data for these stars are listed in a table below. ... Yes . ... WEBDA Pleiades cluster data . ... M45: The Pleiades Star Cluster (2007 November 18) ...

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• VIRGOHI 21
• What is HISA?
• Common Holidays in Relation to Equinoxes, Solstices Cross-Quarter Days

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Noctilucent clouds as photographed by Mark Bailey from Lisdoart on 14th July 2006 at 11.30 pm. ... These so-called noctilucent (night glowing) clouds (NLCs), are formed by sunlight reflecting off ice crystals high in the atmosphere, and usually appear in the northwest, through north to northeast during twilight in the late spring and summer months at our latitude. ...

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• M.D. Smith, Research Astronomer
• IAJ: Product Reviews

... All images on this page are copyright Robert H. McNaught. ... There have been so many requests for high resolution copies of these images that I ask that all enquiries for these to go directly to Science Photo Library. C/2006 P1 on Jan 18, 10:22 UT. Photo: R. H. McNaught, Siding Spring Observatory. Canon 5D, 135mm, f/2.0, 2 sec exp., ISO 1600 . ... ISO 200 . ... Canon 5D, 50mm, f/2.0, 30 sec exp., ... Canon 5D, 135mm, f/2.0, 120 sec exp., ... Canon 5D, 50mm, f/2.0, 110 sec exp., ...

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• Comet Collisions Unlikely
• GSAOI CoDR Pictures Page
• PPT Slide

... Laboratory for Spectroscopy of Molecular Structures . ... News . ... A new article entitled Description of optical properties of cholesteric photonic liquid crystals based on Maxwell equations and Kramers-Kronig relations has appeared in Physical Review E. Congratulations to Grigoriy Ksyonz on his first publication! . 25 th February 2013 . ... 22 nd November 2012 . ... 22 nd February 2012 . 4 th Workshop on Liquid Crystals for Photonics 2012 will take place in Hong Kong December 9-11, 2012. ...

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• Laboratory of materials for electrochemical technologies ISSP RAS

... About ATNF overview . ... Governance overview . Australia Telescope Steering Committee . ... Visitor list . ... Parkes radio telescope . ... Parkes | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... What is a pulsar? ... Group . ... Parkes Pulsar Observing Wiki . ... Pulsar Groups . ... Main / . ... Nov 1, 2010 - Jan 31, 2011 . ... Dec 8 - 17, 2009 . ... Dec 13 - 23, 2006 . ... Dec 3, 2006 - Jan 5, 2007 . ... Aug 10 - Dec 7, 2006 . ... Dec 31, 2005 - Feb 1, 2006 . ...

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• VSOP Observing Schedule
• Intergalactic Clouds
• Small HI Clouds in Nearby Groups

... Main . ... April 2016 . ... December 2015 . November 2015 . October 2015 . September 2015 . August 2015 . July 2015 . June 2015 . May 2015 . April 2015 . March 2015 . February 2015 . January 2015 . December 2014 . November 2014 . October 2014 . September 2014 . August 2014 . July 2014 . June 2014 . May 2014 . April 2014 . March 2014 . ... December 2013 . ... April 2013 . ... December 2012 . ... April 2012 . ...

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Small quantity of engineering data (RIU direct) bypasses NSSC-I . NSSC-I can provide an additional level of subcommutation to the data . ... This table is accessible to the SI specific application processors . This table is also accessible to the SI specific applications processors . Used like the PITs, provides communication between SI computers and NSSC-I . This table is accessible to the SI specific applications processors . ... Previous slide . Next slide . ...

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• WFC3 Data Handbook
• NICMOS Data Handbook
• STScI Preprint #1204

Astronotes Armagh Planetarium's Stellar Blog! ... Colin Johnston . ... This submillimetre-wavelength image of the region surrounding the reflection nebula M78 made with the Atacama Pathfinder Experiment (APEX) telescope (overlaid on a view of the same region in visible light) shows the position of interstellar dust grains (orange) to show where new stars are being formed.( ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration. ...

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• The Blue Planet | Astronotes
• classical mythology | Astronotes
• Monthly Sky Notes | Astronotes

... Almost two year long scrutinizing some publications by astronomers gave me enough impression that astronomers live in the Gaussian world. ... Category: arXiv , Astro , Bad AstroStat , Cross-Cultural , Frequentist , Jargon , News , Quotes , Stat , Uncertainty | ... He quotes Fisher who described a statistician as a post-mortem examiner or a pathologist, but thinks that statisticians (statistical consultants) are doctors who maintain close, active, and alive relationships with their patients. ...

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• The AstroStat Slog Blog Archive Feynman and Statistics
• The AstroStat Slog Blog Archive All models are wrong, but some are useful
• The AstroStat Slog CLT

... In temperate latitudes, this is a good time to see halos formed by clouds of ice crystals high in the atmosphere where the temperature is always well down below -30 deg. ... The most prominent halos, however, appear quite close to the sun where it can be uncomfortably bright to look. ... In a sense, halos are like rainbows, glories and coronae in that they require the presence of a bright source of light, the Sun or the Moon, and water floating in the air. ...

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• ESO - Science Announcements
• ESO - ESO-Enews #16: August 2010
• Fonts used in the guide

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . Sun . ... News . ... Supernova showered Earth with radioactive debris . ... Imaging Basics . ... New images show cloud exploding from Sun ripples like clouds on Earth . ... Scientists, led by a researcher at the University of Warwick, United Kingdom, studying new images of clouds of material exploding from the Sun have spotted instabilities forming in that exploding cloud that are similar to those seen in clouds in Earth's atmosphere. ... LATEST NEWS . ...

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• What caused a giant arrow-shaped cloud on Saturn's moon Titan? | Astronomy.com
• Is there evidence of Oort-Cloud-like structures around other stars? |
• Why do sunspots appear in groups? | Astronomy.com

... About meteorites . ... Meteorite Dronino . ... New iron meteorite shower found! Meteorite Encyclopedia . ... About laboratory . ... Dronino iron meteorite . ... Mr. Gus'kov felt that further efforts by Milanovsky were likely to be unsuccessful, so he searched further and found our Meteorites Laboratory. The Laboratory's analysis showed that the Dronino Iron has a meteorite origin. ... Dronino is the 111th meteorite and only the third iron-meteorite shower found in Russia in the last 250 years. ...

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