... 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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... Data Reduction FAQ > The reduced science spectrum displayed in the Reflex window appears good but when I try to plot it, it is quite different. How can I get it? ... Observing with ESO Telescopes . ... ESO-MIDAS . ... Reflex . ... ESO Data . ... ESO HST Image Galleries . ... ESO Data Access Policy . ... ESO Science Newsletter . ... ESO Annual Reports . ... Seminars at ESO Santiago . ... Seminars at ESO Garching . ... ESO Telescope Bibliography . ... Last Update: 01.04.14 ESO . ...

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• Astronomical Image Retouching

... Tonight's Sky . ... Sky this Month . ... Star Atlas . ... stars . ... The Sky This Week: April 1 - 10 . ... Observing springtime deep-sky objects with a large telescope . ... Why do some stars appear to flash a variety of different colors when you look at them through a telescope? ... So, Earthт??s atmosphere will bend some colors from especially bright stars more so than others, which makes the source look like itт??s flashing colors. Get instant access to subscriber content on Astronomy.com! ...

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• How were the constellation boundaries set? They appear pretty arbitrary. |

... 2010 March 15 . Illuminated Cloud Trails Above Greece . ... Explanation: It may appear to be day, but it's night. Those wondrous orange streaks may appear to be rays from the setting Sun, but they're actually thin clouds illuminated by the Moon as they quickly streaked toward the distant horizon. The thick clouds on the far left may appear to have many layers, but actually they are just a few simple clouds captured on numerous separate exposures. ... Your opinion requested: Is APOD a blog? ...

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• APOD: 2005 August 8 - Mars to Appear Normal this August
• APOD: 2014 January 29 - Jelly Donut Shaped Rock Appears on Mars
• APOD: 2010 November 29 - Dark Belt Reappearing on Jupiter

... While space seems to be expanding at present (just as in our own universe), this expansion seems to be a recent phenomenon: in the past it appears to have been contracting. Data It is now clear that fuzzballs are actually galaxies. ... For the brightest fuzzballs, those from which we detect more than 100 photons per second, the pattern seems to match what we would expect. The fuzzball galaxies are indeed redshifted, and the fainter ones are more redshifted than the bright (nearby) ones. ...

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• http://www.mso.anu.edu.au/pfrancis/roleplay/ziggy/model_answer3.pdf
• VV29 = Arp 188 = The Chainsaw Galaxy

... In this Mars Global Surveyor image of the Martian surface just south of Schiaparelli crater, dark lines appear to criss-cross light colored depressions. One tantalizing possibility is simply that the feature near.. ... A Distant Cluster of Galaxies . ... Oddly - most of them are spiral galaxies. This rich cluster of galaxies, named CL 0939+4713, is almost half way across the visible universe. ... On the far side of our Galaxy, gas clouds explode away from a small black hole. ...

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Making HST Pictures: Examples and Illustrations . ... These illustrations represent some of the steps and techniques used to produce “pretty pictures” from HST images. ... TIFFs (ftp) . ... Separate images are exposed through different color filters. ... An alternate way to make color images . ... Eight bit (one byte) images contain 256 different values that may be represented by 256 shades of gray or 256 arbitrary colors from a color map (or palette) of all possible colors. ...

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• WFPC2 Instrument Handbook Update
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... STScI-PRC01-04 HUBBLE'S ULTRAVIOLET VIEWS OF NEARBY GALAXIES YIELD CLUES TO EARLY UNIVERSE Astronomers are using these three NASA Hubble Space Telescope images to help tackle the question of why distant galaxies have such odd shapes, appearing markedly different from the typical elliptical and spiral galaxies seen in the nearby universe. ... Light from these galaxies travels great distances (billions of light-years) to reach Earth. ... These stars emit mostly ultraviolet light. ...

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• APOD: November 5, 1997 - The Milky Way's Gamma-Ray Halo
• Mars' Moon Phobos
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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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• The AstroStat Slog light curve
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The antenna element Ravi ATNF, Narrabri 1. ... Miriad works out the radio Parabolic reflector: A parabolic reflector adds all the fields from a surface = aperture at a focal point. ... Feeds are `compact' and `corrugated' horns The inner profile is curved The inner surface has grooves Cross-section of a horn Sub-reflector 28 main-reflector Feed horn O `optical axis' The feed horn adds all the rays that come from the 28 deg. wide sub-reflector. The feed down-weights rays that come off-axis. ...

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• SM - Overloading Keywords
• The spectral energy distribution of PKS 2004-447: a compact steep-spectrum
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... Transitions between these levels gives line at 1.25 cm. ... 1.0 L/M=0.998 0.8 1.0 i=30 0.8 o Flux (arbitrary) 0.6 Flux (arbitrary) 0.6 0.4 0.4 0.2 0.2 D E 0.6 F 0.8 / 1.0 1.2 1.4 1.6 0.0 0.6 0.7 0.8 0.9 / 1.0 1.1 1.2 0.0 0.2 0.4 (a) Two wings 1.5 1.0 L/M=0.998 0.8 1.0 (b) Var ying rotation Flux (arbitrary) 0.6 Flux (arbitrary) C B 1.0 / 1.2 1.4 A 1.6 0.4 0.6 0.8 0.5 0.4 0.0 0.2 0.0 0.2 -0.5 0.4 0.6 0.8 / 1.0 1.2 (c) Var ying inclination (d) Data Figure 1: Fe line from accretion disk round black hole...

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• http://www.mrao.cam.ac.uk/~kjbg1/lectures/lect5.pdf

. To you, the user, it appears as though there is only one type of file in UNIX - the file which is used to hold your information. In fact, the UNIX filesystem contains several types of file. Ordinary files . Directories . Special files . Pipes .

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• rtftohtml Users Guide - 4 Special Processing
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... Observers looking at an object that is moving away from them see light that has a longer wavelength than it had when it was emitted (a redshift), while observers looking at an approaching source see light that is shifted to shorter wavelength (a blueshift). ... By measuring the amount of the shift to the red, we can determine that the bright galaxy is moving away at 3,000 km/sec, which is 1 percent of the speed of light, because its lines are shifted in wavelength by 1 percent to the red. ... Part 2...

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• Discussion
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Solar Large-Scale Chains: Some Events . ... The chains appear to light up separators or quasi-separatrix layers between different interacting large-scale magnetic flux systems in the global solar magnetosphere and, in particular, to outline large-scale coronal structures involved in the CME process. ... Some features of the chains and their relations to CMEs are illustrated for a number of halo CME-associated events. 23 events of 1997-2000 . ... Halo-CME-associated events of November 1997 . ...

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... SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . ... Accidental Astrophysics: The Devil's In the Magnitudes, Part II . ... The star second to the Sun in brilliance is Sirius. ... Recall the magnitude system, passed down to us through a hundred generations of sky watchers, as a means of quantifying stellar brightness ("Accidental Astrophysics," May/June, p. 9). ... Yes, it is a magnitude difference, but that difference is due to the distance between us and the star. ...

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• ASP: Using Multicultural Dimensions to Teach Astronomy
• ASP: A Flag for Mars
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The Wideband Arecibo Pulsar Processor - File Format Page . WAPP files have three sections that appear sequentially in this order: an ASCII header description, the binary header, and finally the actual binary data. ... The WAPP realtime observation engine does not produce files larger that 2 Gbytes. At one time this represented a fundamental limit to Linux files. ... Each file will have it's own header, even when the files are simply continuations of a single observation. ... long int . ...

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• What is HISA?
• The Pleiades
• Mythology of the Seven Sisters (Pleiads)

Seven months ago, on Mar 19, 2008, at 09:12 Moscow time, a new star appeared on the sky. The Sun had already risen over the Russia, but people of the Western hemisphere might be able to see by their eyes a faint starlet near one of Bootes constellation stars. This starlet appeared and faded by an order of magnitude in a minute. Astronomers named it GRB080319B or, informally, the Naked-Eye Burst, as it was twice as bright as human eye can see a star. ... Royal Astronomical Society . ...

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• Evidences of supercritical accretion onto black hole in SS433

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . On Sunday evening, 28th November, the Armagh Observatory was inundated with reports from people who had seen a bright meteor or fireball. ... The Armagh Observatory would like to thank those who have so far reported observations of this event, and encourage any businesses and others who may operate north-pointing CCTV cameras to inspect any video footage recorded between approximately 17:30 and 18:00 on Sunday 28th November. ...

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• Picture including some objects that appear in Orrery
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The multiscale analysis of heterogeneous structures is actually an important and effective tool of mathematical modeling in physics, technique and biology. ... The special year will extend the existing cooperation between French and Russian researchers in the multiscale analysis and in mathematical modeling in hemodynamics, taking into consideration the mass transport, coagulation, fluid-structure interaction and other aspects. ...

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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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• The Sun's Corona
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