... 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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Phobos . Mars I . Phobos [FOH-bohs] (fear) is a moon of Mars and was named after an attendant of the Roman war god Mars. ... Phobos shows striated patterns which are probably cracks caused by the impact event of the largest crater on the moon. ... The striking feature in this image is the giant Stickney crater. ... Courtesy NASA) . ... Because Phobos is only 28 by 20 kilometers (17 by 12 miles), the moon must have been nearly shattered from the force of the impact that caused the giant crater. ...

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Phobos . ... Phobos [FOH-bohs] (fear) is a moon of Mars and was named after an attendant of the Roman war god Mars. ... Phobos shows striated patterns which are probably cracks caused by the impact event of the largest crater on the moon. ... Grooved fractures caused from the impact that created Stickney extend away from the crater. ... Because Phobos is only 28 by 20 kilometers (17 by 12 miles), the moon must have been nearly shattered from the force of the impact that caused the giant crater. ...

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• A collection of images
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... Yogi appears to be leaning into the prevailing winds causing some to suggest that its color contrast may be caused by the accumulation of rust colored dust on its windward face. ... Mira A is a red giant star undergoing dramatic pulsations, causing it to become more than 100 times brighter over the course of a year. ... These ice chips were shed from Comet Swift-Tuttle. ... Dubbed NGC 6589 and NGC 6590, the colors of this nebulosity, are caused by gas and dust. ... The Hydra Cluster of Galaxies . ...

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Some time in dec01 a large ripple appeared in the gregorian dome 430 Mhz data. ... While debugging the problem, it was discovered that turning on the gregorian dome motors caused the ripple to appear. ... The figures show the birdie and the ripple. ... Turning the motors on may have caused some vibrations (although you didn't have to move the dome for the modulation to appear) or the motors turning on could have caused the voltage to sag a bit causing the tone to switch to a modulated wave form. ...

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• First Galfa H I Map
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... 2010 November 29 . Dark Belt Reappearing on Jupiter . Credit: NASA's JPL , U. Oxford , UC Berkeley , Gemini Obs. ... Explanation: Why are planet-circling clouds disappearing and reappearing on Jupiter? ... Earlier this year, unexpectedly, Jupiter's dark Southern Equatorial Belt (SEB) disappeared. ... Detailed professional observations revealed that high-flying light-colored ammonia -based clouds formed over the planet-circling dark belt. ... About APOD | ... A service of: ASD at NASA / GSFC . ...

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From: TerryMosel aol.com Date: Fri, 29 Apr 2005 15:25:46 EDT Subject: Giant sunspot, ISS, Occultation by Saturn's Rings Hi all, 1. ... On January 25, at about 18.45, the 8th mag star BY Cancri will be occulted first by Saturn's Rings, and then by Saturn itself, before emerging from behind the planet's South Pole region. 8th mag does not sound very bright, but it's about half a magnitude brighter than Titan, Saturn's brightest moon. ... Clear skies, Terry Moseley . ...

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• Geminid Meteors
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... Submitted by Al Takeda on 05/25/2012 09:05:53 . Sunspot 1476 . While checking out my equipment for the Venus transit, I imaged the naked eye sunspot #1476. ... Sunspots are temporary features in the Sun’s photosphere that are caused by intense magnetic field lines emerging from the interior. The spot appear dark because it is relatively cooler then the surrounding photosphere. ... ATMoB Clubhouse, Westford, MA, 12 May 2012. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... Observing . ... Sky this Month . ... Observing Podcasts . ... Astronomy for Kids . ... Get to Know the Night Sky . ... Observing springtime deep-sky objects with a large telescope . ... Do scientists know what caused Valles Marineris on Mars? ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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• Brief pulse detected by Arecibo telescope appears to come from far beyond our
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• Why do aurorae appear strongest within rings centered on Earth's poles instead

Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 03 - 09.08.2015, Forecast on 10 - 17.08.2015, Carrington Rotation 2166, 2167 (14,84.07; 07,30.09.2015) SUNSPOT-FORMING ACTIVITY OF THE SUN WAS AT THE AVERAGE LEVEL. ... Therefore all energy of the emerging magnetic fluxes was realized in fla- res of class C and S (36 for three days). ... ACCORDING TO THE DATA FROM SOHO AND STEREO CORONOGRAPHS, >35 CMEs ONE WAS "PARTIAL HALO II" TYPE (angular width 90 - 180 deg.) HAVE BEEN OBSERVED. ...

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• CMEs and Space Weather

... 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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... The WFPC2 CCDs have a small b ut significant charge transfer efficiency (CTE) problem which causes some signal to be lost when charge is transferred down the chip during readout. This has the effect of making objects at higher row numbers (more charge transfers) appear fainter than they would if they were at low row numbers. The effect depends on the temperature of the CCDs. ... It is also possible that proportional losses for fainter stars, at least with no background, may be larger. ...

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• Photometric Anomalies
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To construct frequency distribution (histogram) of minor planets according to value of some element/ parameter/ function user should first select Elements item in menu bar and then Histogram in drop-down menu. ... User has possibility to save histogram or to print it using standard means. To save the file select File item in menu bar and then Save As... in drop-down menu. ... To print histogram select File item in menu bar and then take advantage of options Print Preview , Print Setup , Print . ...

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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. ...

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• The Galaxy Gallery: Messier Objects

... Artist?s conception of the collision of Comet Shoemaker-Levy 9 with Jupiter, as seen from the Galileo spacecraft. At the time of the first impact, the comet fragments will be much farther apart than shown in this illustration. ... One orbit, computer May 18, 1993 by Syuichi Nakano, showed that the comet passed close to Jupiter in July 1992, and would pass within 45,000 kilometers of the center of Jupiter in July, 1994. ... The fragments of Shoemaker-Levy 9 move around Jupiter. ...

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The Stone Age Observatory. It is well known that a lot of ancient constructions are oriented according to the cardinal points but not long ago scientists turned upon archeological monuments. ... The ancient monuments studied by archeoastronomy had been used for observing the sun and the moon. ... They are called megalits (from Greek "megas" - "great"; "litos" - "stone"). ... The Great Stonehang. ... Orby called it a Heel Stone because he had seen a small hole in it looked like a heel trace. ...

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• Galiliye
• Astronomy
• moonkratluchie

... Meta Index / Home Page / Running the program . The function of the various buttons are described below. ... Select spectra Allows the user to select new spectra from the image. ... The button is disabled if the source-list is not empty- The source-list can be deleted using the Delete button, allowing omdetect to be run. ... Load source-list Allows the user to select another source-list file. ... Information Allows the user to display information about either the program, exposure or image details. ...

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• Parallel detection over bands (with no assumptions made about source spectrum)
• Procedure

True Color Image Gallery: Galactic SNR | Magellanic Cloud SNR . ... Chandra Proposer's Guide pile up section ] During frame readout, the ACIS CCDs take 40 microsec to (parallel) transfer the charge by one pixel. As a result of this, each frame readout, each pixel is exposed for 40 microsec to a source (plus cosmic X-ray background) at each location along its column. ... Note also that the image does not just trail, it extends along the whole column. ... Chandra Supernova Remnant Catalog . ...

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• Select a circle around the central point source
• The AstroStat Slog astro-ph
• The AstroStat Slog positional citation effect