... 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. ...

... Big planets are highly circular. PPT Slide . Things are very different for small planets . ... Surface Gravity . Gravity correlates with Size . ... 433 Eros . Atmospheres: big planets are all atmosphere . Medium sized planets have moderate atmospheres . Small planets have no atmospheres . Atmospheres . ... Home Page: http://msowww.anu.edu.au/~pfrancis/astr1001/ . ... Course Notes for ASTR1001 Astronomy ...

... idl /home/chummel/oyster/oyster . ... gdl /home/chummel/oyster/oyster . Provided IDL (version 5.0 or higher) or GDL (version 0.9.3 or higher) is installed, the language will start up and read and execute the commands in oyster/oyster.pro . This procedure file will first determine the location of the oyster , atmospheres , and catalogs home directories, then load the compiled procedures in oyster.cpr , set the common blocks and call the procedure setup_oyster to finish the setup. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2000 November 25 . A High Energy Fleet . Courtesy: MSFC Historical Archive , NASA . Explanation: Like a fleet of futuristic starcruisers, NASA's highly successful series of High Energy Astrophysical Observatory (HEAO) spacecraft appear poised over planet Earth. ... Archive | ... About APOD | ... NASA Technical Rep.: ...

... Spirit Rover on Mars Imaged from Orbit . ... MRO arrived at Mars in March and just started science observations of the red planet last month. ... In the Arms of NGC 1097 . ... A smaller companion seems wrapped in the spiral arms of enigmatic galaxy NGC 1097. ... Unusual Starburst Galaxy NGC 1313 . ... Spiral galaxy NGC 1313, however, appears to be alone. Brightly lit with new and blue massive stars, star formation appears so rampant in NGC 1313 that it has been labeled a starburst galaxy. ...

The basic problems of the Laboratory are connected with researches of dynamics of minor planets and comets. ... THE ORBIT IMPROVEMENT of minor planets from optical and radar observations, . the utilization of minor planet observations for THE DETERMINATION OF ORIENTATION OF STAR CATALOGUES and DETERMINATION OF MASSES OF MINOR PLANETS BY DYNAMICAL METHOD, . THE ESTIMATION OF COLLISION PROBABILITY of minor planets with other bodies and with each other, . ...

Comets are small, fragile, irregularly shaped bodies composed of a mixture of non-volatile grains and frozen gases. ... Most become visible, even in telescopes, only when they get near enough to the Sun for the Sun's radiation to start subliming the volatile gases, which in turn blow away small bits of the solid material. ... Nearly 100 known comets have periods (the time it takes them to make one complete trip around the Sun) five to seven Earth years in length. ...

From: TerryMosel aol.com Date: 30 November 2006 00:12:38 GMT Subject: Greenwich job, Geminid Meteors Hi all, 1. ROYAL OBSERVATORY GREENWICH: Job Vacancy - Astronomer - Public Engagement: Astronomer - Public Engagement. ... You can start to see the first Geminids in the late evenings from about December 8, but activity starts to pick up about the 10th, building to the maximum which this year will be in the early hours of December 14. ... Clear skies, Terry Moseley . ...

Astronotes Armagh Planetarium's Stellar Blog! ... This image combines orbital imagery with 3-D modelling to show flows that appear in spring and summer on a slope inside Mars' Newton crater. ... Warm season flows on a slope in Newton Crater, possible evidence of salty liquid water active on Mars today. Image credit: NASA) . ... Frozen water is common on and under the surface of Mars but these images are the best evidence to date for the presence of liquid water on the Martian surface today. ...

... The HH flow associated with young stellar object HL Tau has an exciting history and even until now the origin of some its features is not clear yet. ... Knotty structures of Herbig-Haro jets are common phenomena and knowing the origin of such structures is essential for understanding the processes of jet formation. ... In the flow detected compact knots with high (-150 km/s) and bow shape structures in front of those, with low radial velocities (-50 km/s). ...

... Indiana Jones is a registered trademark of Lucasfilm Ltd. ... There's the intrigue of the megaliths of Stonehenge, the ancient pyramids of Egypt, the earthen figures of Britain and Peru, and the bloody rituals of the Maya. ... To make sense of these great structures and sophisticated concepts, archaeologists and astronomers have pooled their talents. ... People could use these alignments to synchronize their calendars or track the exact path of a celestial object. ... Maya glyphs of Venus. ...

Next: Modelling Up: Superresolution of SN 1987A: Previous: Introduction . ... Iterative algorithms were started with a flat default, as more sophisticated choices of starting point made little difference. ... The deconvolution algorithms described below were used for the initial mapping. ... It agrees with the other algorithms on the major features, produces a plausible physical image, performs well on simulated data with a high degree of superresolution, and is robust to support constraints. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Astronomy for Kids . ... Can you explain Mercury's retrograde motion? Do other planets appear to do this also? ... When astronomers talk about retrograde motion, generally they refer to the apparent motion outer planets make as Earth passes them while orbiting the Sun. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

plots: . The position and status bits of the system during the failure (40 seconds) (.ps) ( .pdf ). ... Gregorian motor torques during the failure (.ps) ( .pdf ) . Amplified 21 and 22 on the dome have failed with amplifier not ready. ... The status bits of the system during the failure (25 minutes) (.ps) ( .pdf ). page 1-4 Dome axis status. page 5-8 tracking status, Dome power supply status . ... Dome amplifier status. ... There have been 4 amplifier not ready failures on the dome. ...

... You are here: start €Ё correlator €Ё archiving . ... Archiving the Correlator Output Data . ... Final output . ... The wiki pages are linked from the correlator records spreadsheet ( LBA or Auscope ). cd /data/corr/pipe/<expname>/out lba_feedback.py <expname>.wikilog > <expname.txt> archpipe <expname> .joblist (not critical) .v2d .vex .difxlog (DiFX messages from errormon2) .input .calc .im .uvw [DiFX 1.5] .delay [DiFX 1.5] .rate [DiFX 1.5] .flag .difx (output directory - may contain multiple files)...

... Search . ... Astrophysics Group . Research . ... Research and Instrumentation . ... While this seems an extraordinary endeavour, in light of what we have learnt about Solar System planets, only a handful of key ingredients are required to start characterising an exoplanet. ... The NGTS project is a partnership between the University of Cambridge, Queen?s University Belfast, University of Warwick, University of Leicester, Observatoire de Geneve, DLR (Berlin) and Universidad Catolica de Chile. ...

... A rough estimation is that in the United States there is one planetarium per 100,000 population, ranging in size from the Hayden Planetarium's 20-meter dome seating 430 people, to three-meter inflatable portable domes where children sit on the floor. ... Together dblo associates make a huge impact in the architecture, interior design and development arena in London. ... With the holidays around the corner what better way to spoil your family than with your very own private home cinema. ...

Astronomy Discussion Forums . ... Atm ћ Astrophotography ћ Blackholes ћ Blackholes2 ћ CCD ћ Celestron ћ Domes ћ Education . ... New model: How do the Sun and Moon appear to move across the sky - mito111 - September 15, 2011 - 04:22 UTC . ... Note the change - rick_crockett - April 19, 2007 - 09:38 UTC . ... A Question Regarding Photons and Absolute Zero - inalitalllane - December 25, 2004 - 22:06 UTC . ... Virtual Space Agency - dupagepilot - November 18, 2003 - 12:03 UTC . ... www.astronomy.net . ...

Plasma is sometimes called "the fourth state of matter", beyond the familiar three--solid, liquid and gas. It is a gas in which atoms have been broken up into free-floating negative electrons and positive ions , atoms which have lost electrons and are left with a positive electric charge. ... The fluorescent lamp , widely used in the home and at work, contains plasma (main constituent, mercury vapor) which is heated and agitated by electricity, from the power line to which the lamp is connected. ...

... II-VI compounds available: . ZnSe; ZnS; CdSe; CdS . ... See the table below; follow links for detailed data . ... Content of impurities, wt.%, in powder . ZnSe . ZnS . CdSe . CdS . ... 2.4 10 -6 . ... Material Safety Data Sheets for: ZnSe , ZnS , CdSe , CdS . ...