... 2013 July 1 . Orbiting a Black Hole . ... Explanation: What would it look like to orbit a black hole? ... For another, the sky near the black hole would appear significantly distorted , with more and more images of the entire sky visible increasingly near the black hole. ... Orbiting a black hole, as shown in the above scientifically-accurate computer-created illustrative video, will show stars that pass nearly directly behind the black hole as zipping around rapidly near the Einstein ring. ...

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• APOD: 2013 July 2 - Circling a Black Hole at its Photon Sphere

Orbiting a Black Hole . ... Since the strong gravity of the black hole can significantly alter light paths, conditions would indeed look strange . For one thing, the entire sky would be visible , since even stars behind the black hole would have their light bent to the observer's eye. For another, the sky near the black hole would appear significantly distorted , with more and more images of the entire sky visible increasingly near the black hole. ... NASA Official: Jay Norris. ...

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• Астронет > Orbiting a Black Hole
• Orbiting a Black Hole
• Circling a Black Hole at its Photon Sphere

... 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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Blackholes Forum Message . Forums: . ... Blackholes I | ... Use Light Radited From Stars Orbiting The Black Hole . ... My understanding is that that is how black holes are detected. Photons that are claimed to be circling a black hole are actually within the event horizon. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Orbiting Light Retrieval? - an Astronomy Net Blackholes Forum Message
• Black Holes And RedShift - an Astronomy Net Blackholes Forum Message

... NASA's Hubble Space Telescope has provided a never-before-seen view of a warped disk flooded with a torrent of ultraviolet light from hot gas trapped around a suspected massive black hole. ... This composite image of the core of the galaxy was constructed by combining a visible light image taken with Hubble's Wide Field Planetary Camera 2 (WFPC2), with a separate image taken in ultraviolet light with the Faint Object Camera (FOC). ... The inset box shows Hubble Space Telescope's field of view. ...

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• Hubble Uncovers Dust Disk Around a Massive Black Hole (STScI-PRC98-22) A
• APOD: October 8, 1996 - ROSAT Explores The X-Ray Sky
• APOD: June 21, 1999 - The Galactic Center in Infrared

... HUBBLE UNCOVERS DUST DISK AROUND A MASSIVE BLACK HOLE . Resembling a gigantic hubcap in space, a 3,700 light-year-diameter dust disk encircles a 300 million solar-mass black hole in the center of the elliptical galaxy NGC 7052. ... Because the jets in NGC 7052 are not perpendicular to the disk, it may indicate that the black hole and the dust disk in NGC 7052 do not have a common origin. ... NGC 7052 is located in the constellation of Vulpecula, 191 million light-years from Earth. ...

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• HST this week: 271
• Active galaxies and black holes
• John H. Debes

... self-absorption - the absorption of light shining on an object by a process similar to that which produced the light originally; if a cloud emits less light than it absorbs from other clouds behind it, this net loss of light, termed self-absorption , causes the foreground cloud to appear darker than the background field (the term is from spectroscopy, where small absorption dips sometimes occur in larger emission lines, making the latter look as if it is absorbing part of itself) . ... HISA Main ...

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• The Pleiades

... Another option is to buy slides of astronomical objects at different wavelengths to show students why astronomers use different bands of the spectrum to bring out specific characteristics in celestial objects. ... He then uses the camera to scan the entire classroom, asking students to identify what they are seeing. ... Once students see light in action, they can investigate its properties - such as frequency, wavelength, and interference - with wave experiments. ...

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• ASP: Accidental Astrophysics: The Devil's In the Magnitudes, Part II
• ASP: Black Holes
• ASP: Making a Rainbow

... Our Sun is part of a huge wheel-shaped collection of stars. ... Astronomers have long suspected it was a very massive black hole, and that every galaxy had such a central mass, created early in the history of the universe. ... However, unless that object happens to be headed directly at the black hole (a relatively small target) it will just swing around and fly away again, like a comet making a pass at the Sun. The velocity acquired in falling towards the black hole also helps it escape. ...

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• Auroral Images
• Spacecraft Observing the Sun and the Heavens above

... We have measured this "redshift" for the pink black holes, and allowed for it in our calculations. ... We see this effect in the emission from gas around these pink black holes, but it is far too small an effect to account for the pinkness. Thus the swirling motions of gas around or into the black holes cannot produc the colour. ... At first we thought that these things were normal blue black holes hidden behind clouds of interstellar dust, that absorbed the blue light and made them appear pink. ...

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• IAU Commission #34 (Interstellar Matter)
• C/2006 P1 (McNaught)
• Paul Francis -- Astronomical Constants

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

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• The VLT Survey Telescope: the largest telescope in the world designed for
• Comparison of the Trifid Nebula in visible and infrared light | ESO
• Millimetre-range and visible-light views of a star-forming filament in Taurus |

... SS433 is a close binary system, one star is a supergiant, a second one is a black hole. ... Even a black hole cannot accept such an enormous mass flux, a supercritical accretion disk appears, all the excess gas glows up to several tens of thousands degrees and is ejected off the disk with enormous velocities. ... SAO researchers have found an evidence of the supercritical accretion onto a black hole in SS433, which follows from a brightness variability of the SS433 disk. ...

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• Northern Lights and GLORIA
• SciNews archive
• Galaxy sector, archive 2014

... The event horizon is the boundary of a black hole) . ... When the supermassive star implodes (collapses under it?s own gravity) a black hole is formed. Many black holes have been found in the centres of galaxies. ... It was thought that black holes don?t give out any energy at all (except when engulfing stars). ... It is thought that as the stars pass near to the centre, they are pulled in by the black hole and forced to remain orbiting around the black hole. ...

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• Armagh Observatory
• Earthshine
• Abstract

... Robert L. Stewart (Brigadier General, USA, Ret.) ... SPECIAL HONORS: Awarded Army Distinguished Service Medal , Defense Superior Service Medal , 2 Legion of Merit, 4 Distinguished Flying Crossed, a Bronze Star, a Meritorious Service Medal , 33 Air Medals, the Army Commendation Medal with Oak Leaf Cluster and V Device, 2 Purple Hearts, the National Defense Service Medal , the Armed Forces Expeditionary Recipient of NASA Space Flight Medal (1984 & 1985). ...

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• Astronaut Bio: Robert Curbeam (12/2007)

. The real monster black hole is revealed in this image from NASA's Nuclear Spectroscopic Telescope Array of colliding galaxies Arp 299. In the center panel, the NuSTAR high-energy X-ray data appear in various colors overlaid on a visible-light image from NASA's Hubble Space Telescope. The panel on the left shows the NuSTAR data alone, while the visible-light image is on the far right. NASA/JPL-Caltech/GSFC

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• Black-hole light show | Astronomy.com
• Bright planets meet at dusk | Astronomy.com
• Why do aurorae appear strongest within rings centered on Earth's poles instead

... These are the systems which contain compact components of different nature, white dwarf, neutron star or black hole. ... Pulsar appears during X-ray outbursts, but it does not manifest itself in the quiet state (Be stars, BQ Cam, V490 Cep); -falling of low -mass bodies on a compact object due to gravitational capture (a comet nucleus or a meteoroid ) in the detached system (V934 Her, V4641 Sgr). ... B1V-B2Ve star + neutron star & pulsar on the 20.85-day orbit Cep X-4 (ROSAT/PSPC) 1993 . ... 1000/ . ...

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• http://jet.sao.ru/jet/~goray/v4641/at4641.htm

... Astronomy news . ... NASA's Spitzer Images Out-of-This-World Galaxy . ... It is spiral-shaped like our Milky Way, with long, spindly arms of stars. The "eye" at the center of the galaxy is actually a monstrous black hole surrounded by a ring of stars. In this color-coded infrared view from Spitzer, the area around the invisible black hole is blue and the ring of stars, white. ... The ring around the black hole is bursting with new star formation. ...

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• The CORONAS-PHOTON has registered the formation of the Sun's southern belt of
• Publications

... ATNF Home . About ATNF . ... About ATNF overview . ... Governance overview . Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Parkes | ... Spectrum management . Spectrum management overview . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... Types of Spectra . ... One means by which a continuous spectrum can be produced is by thermal emission from a black body. ...

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• NGC 2915: The Darkest Spiral Galaxy
• Binary Variable Star Questions
• Merging Black Holes in Galaxies: Galaxy Evolution, AGN and Gravitational Waves

... 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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• INTAS project 99/652: Publications

Electron-Bombarded, Back-Illuminated CCD Sensors . For Low-Light-Level Imaging Applications . ... A voltage potential accelerates the amplified electron signal from the MCP output onto a phosphor screen where the image is converted back to light. A glass fiberoptic element couples the phosphor screen image out of the tube. ... An Electron Bombarded CCD (EBCCD) eliminates the complicated image transfer chain by inserting a thinned back-illuminated CCD into the image intensifier tube. ...

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• Anomalous Dispersion
• Doppler Shift
• Drawables and Pixmaps