... NGC 6164: A Bipolar Emission Nebula . ... How did a star form this beautiful nebula? ... The First Rocket Launch from Cape Canaveral . ... Gamma Ray Earth . ... The pixelated planet above is actually our own planet Earth seen in gamma rays - the most energetic form of light. ... Reflections on NGC 6188 . ... Located 4,000 light years away in the disk of our Galaxy, NGC 6188 is home to the Ara OB1 association, a group of bright young stars whose nucleus forms the open cluster NGC 6193. ...

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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. 2005 December 6 . The Veil Nebula Unveiled . ... At the time, the expanding cloud was likely as bright as a crescent Moon toward the constellation of Cygnus , visible for weeks to people living at the dawn of recorded history . ... The Veil Nebula is also known as the Cygnus Loop . ... About APOD | ... NASA Official: Jay Norris. ...

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• APOD: 2004 December 8 - In the Center of the Heart Nebula
• APOD: 2004 December 29 - The Helix Nebula from Blanco and Hubble
• APOD: 2006 December 27 - IC 5067: Emission Nebula Close up

Photon Scattering: Basic Principle of Photon Scattering . Audio Narration is available . No Scattering: Photon Source and Detector . ... For optical photons, scattering goes as wavelength to the -4 power. In the case of blue photons compared to red photons, this means that blue photons are about 10 times more likely to get scattered than red photons. ... Watch the blue photons scatter away from the detector . ... Interstellar dust make stars appear redder than they really are . ...

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• Low Surface Brightness Galaxy Gallery

... December 8, 1996 . Degas Ray Crater on Mercury . ... Explanation : Like the Earth's Moon, Mercury is scarred with craters, testifying to an intense bombardment during the early history of the Solar System. ... In the above mosaic the bright rays emanating from the 27 mile wide Degas crater almost appear to be painted on . The rays consist of light colored material blasted out during the crater's formation. Numerous smaller, younger craters are seen superposed on the Degas crater itself. ...

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• Jupiter's Moon Ganymede
• APOD: 2000 December 29 - The Dark Horsehead Nebula
• New Discoveries From Galileo

Here we report our discovery of a band of blue luminescence (BL) in the Red Rectangle nebula. ... The spectrum of this newly discovered BL is most likely fluorescence from small neutral polycyclic aromatic hydrocarbon (PAH) molecules. ... If the carriers of this near-UV/blue fluorescence are PAHs, they are most likely neutral PAH molecules consisting of three to four aromatic rings such as anthracene (C14H10) and pyrene (C16H10). ...

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• The Nature of Infrared Emission in the Local Group Dwarf Galaxy NGC 6822 as
• STScI Preprint #1204
• COS Instrument Handbook

... Tonight's Sky . ... Observing . ... galaxies . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... WISE launch rescheduled for December 14 . ... The launch of NASA's Wide-field Infrared Survey Explorer (WISE) mission is now rescheduled for December 14, from Vandenberg Air Force Base in central California, with a launch window of 9:09 a.m. to 9:23 a.m. EST. ... Only registered members of Astronomy.com are allowed to comment on this...

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• Bright planets meet at dusk | Astronomy.com
• Jupiter brightens the December sky | Astronomy.com
• December 2005 resources | Astronomy.com

Supernova 1999gs in NGC 4725 . This is a prediscovery image of 1999gs in NGC 4725 taken by Marco Migliardi on December 23.21 1999, during the CROSS Program with the Col DrusciХ 20" "Helmut Ullrich" telescope. This image was taken 5 days before the "discovery" image of 1999gs which was taken by LOSS this image shows a significantly brighter SN than the discovery image shows. ... Back to Bright Supernovae . Back to Bright Supernovae - 1999 . ...

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... Stars . ... Straight away the three stars in his belt will grab your attention, followed by the glittering white star Rigel in his left foot and the bright orangish star Betelgeuse in his right shoulder (assuming Orion is standing facing us and not with his back to us). ... Orion Belt?s with the stars Alnitak, Alnilam and Mintaka. ... In short, Orion was a big, loud giant of a man and indeed a mighty hunter, he also inherited some aquatic superpowers from his father who was the sea god Neptune. ...

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• The December 2015 Night sky | Astronotes
• M78 off Orion: Bladerunner Nebula? | Astronotes
• stellar nursery | Astronotes

... 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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• Rhiannon Zoe Nolan Howell 1999 December
• Common Holidays in Relation to Equinoxes, Solstices Cross-Quarter Days
• water ice on mercury

... The expansion is measured as a number called the Hubble Constant . ... Our value is about 20% lower than the one got with the Hubble Space Telescope in 1994," said Dr Jim Lovell, leader of the team that made the measurement. The Hubble Constant is named after American astronomer Edwin Hubble, who in the 1920s found that other galaxies were moving away from ours. ... The Hubble Constant links the galaxy's distance with its speed." ... A short run-down on the Hubble Constant: . ...

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• The giant HII region NGC 3603
• NGC 7582
• ATUC report

From: TerryMosel aol.com Date: 11 December 2007 01:47:08 GMT Subject: Comet Holmes, Lecture Hi all, 1. COMET HOLMES: On the way back from the IYA meeting (more on this later), and the AI lecture, in Dublin, Miruna Popescu I stopped at a dark site North of Newry in a lovely clear transparent sky, for a look at P/Holmes. Amazing! ... But it was both brighter bigger that the Double Cluster in Perseus - about a magnitude brighter, I would say, and much bigger than the Moon. ...

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• Featured Image | International Year of Astronomy in Ireland | Astronomy 2009
• Armagh Observatory
• Latest News

ATM Forum Message . Forums: . ... Discussion Forums | ... Off Topic: Looking For Help With Optical Device-like A Borescope . Forum List | ... Post Message | ... I'm looking for some help from you guys, many of whom are likely experts in optical design.. ... 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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• You Can Make Stellar Images Brighter - an Astronomy Net Article
• Alternative Idea - an Astronomy Net Blackholes Forum Message
• Observation Report From Coyle 07/19/03 - an Astronomy Net Observation_reports

Space debris is a serious and growing threat to operating spacecraft. Potential debris collisions with satellites are becoming increasingly likely and can cause economic loss of between $25 million and $500 million per event. ... National and international partners include EOS Space Systems, Lockheed Martin Space Systems (US), Optus Satellite Systems, the Australian National University, RMIT University and the National Institute of Information and Communication s Technology (Japan) . ...

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• http://www.mso.anu.edu.au/~bessell/thumbnails/images.txt
• C/2006 P1 (McNaught)
• The Music of the Spheres

Ganymede . ... Ganymede Statistics . ... Hubble Finds Ozone on Jupiter's Moon Ganymede . ... Like Callisto , Ganymede is most likely composed of a rocky core with a water/ice mantle and a crust of rock and ice. ... Ganymede's mantle is most likely composed of ice and silicates, and its crust is probably a thick layer of water ice. ... Ganymede's surface is rich in water ice and Voyager and Galileo images show features which are evidence of geological and tectonic disruption of the surface in the past. ...

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• The Acceleration of the Aurora
• Field-aligned potential drops [Oulu]
• Uranus' New Moons

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

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• Galaxy sector, archive 1994
• A unique isolated dwarf spheroidal galaxy KKR25
• CH Cyg

... In most situations, light helps us to see. But when it comes to looking at the night sky, light actually blocks our vision. ... You should be able to see around 2,500 stars with your naked eyes, but if you live in a big city or town, you probably see less than 10 stars on a normal night! This amazing space picture shows the shining star clusters and swirls of colourful gases of the Carina Nebula: an enormous expanse of gas, dust and stars lying deep in the heart of the Milky Way. ...

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• http://www.eso.org/public/news/eso1521/kids/
• http://www.eso.org/public/news/eso1141/kids/
• http://www.eso.org/public/news/eso1412/kids/

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... When Venus is on the far side of the Sun, we see the entire near side lit by the Sun. ... When it is on the near side of the Sun, it shows a beautiful thin crescent, because it is between us and the Sun and we see the mostly unlit dark half. ... To see this for yourself, draw a circle one centimeter across, then, next to it, draw a circle 6 centimeters across. ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Bad News: The Salisbury ``Meteorite''
• Phil Plait's Bad Astronomy: Bitesize Tour of the Solar System

... Equivalent widths of Ca I absorption lines at 6122?, 6162?, and 6494? and Fe I at 6103?, 6200?, and 6574? were measured for several spectral standards. ... The spectral types of the target stars were determined by comparing source line ratios to those of standard stars. ... The uncertainty in the spectral type is about one and a half sub--types. ... Northwest of the belt, again all but one source shows Li in absorption, but only one star (out of 13 = 7.7%) shows an H emission line. ...

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• The AstroStat Slog Blog Archive I Like Eq
• The AstroStat Slog 2008 December
• The AstroStat Slog 2007 December

arXiv.org > astro-ph > arXiv:0709.1735 Title: CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates Authors: Stephen E. Healey, Roger W. Romani, Garret Cotter, Peter F. Michelson, Edward F. Schlafly, Anthony C. S. Readhead, Paolo Giommi, Sylvain Chaty, Isabelle A. Grenier, Lawrence C. Weintraub (Submitted on 11 Sep 2007) We describe a uniform all-sky survey of bright blazars, selected primarily by their flat radio spectra, that is designed to provide a large catalog of likely gamma-ray AGN. ...

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• Source Positions
• Results and conclusions
• The Hamburg/RASS Catalogue of optical identifications

... The Sun . Does anyone know how many stars are there in the solar system? Come take a look at the Sun. See that? ... Did you know all the stars you see when you look up are inside our galaxy! ... Did you know that our Sun and solar system were born in a cloud of gas and dust like this. ... We're looking at a place where stars are being born. ... Sharing the Universe is based upon work supported by the Informal Education Division of the National Science Foundation under Grant no DRL-0638873. ...

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• ASP: The Real Stars of Harry Potter
• ASP: Taking a Grand Virtual Voyage in the Milky Way
• ASP: Contents, Autumn 2008