... Sprawling across hundreds of light-years, emission nebula IC 1396 mixes glowing cosmic gas and dark dust clouds. Stars are forming in this area, only about 3,000 light-years from Earth. ... Moon and Mars Tonight . ... The Full Moon and a brilliant, ruddy Mars will share the sky tonight. ... Of course, the December Solstice marks the beginning of winter in the northern hemisphere and summer in the south. Horizon to Horizon . ... Unusual Silica Rich Soil Discovered on Mars . ... December 2012 . ...

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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. 2007 December 24 . Emission Nebula IC 1396 . ... Explanation: Sprawling across hundreds of light-years, emission nebula IC 1396 mixes glowing cosmic gas and dark dust clouds . ... APOD presents: Astronomy Pictures of the Year for 2007 . ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

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• APOD: 2005 December 12 - 30 Doradus: The Tarantula Zone
• APOD: 2002 December 20 - Colorful Clouds of Orion
• APOD: December 9, 1999 - X-ray Hot Supernova Remnant in the SMC

... Armagh Planetarium . ... Universe . ... Posted on January 19, 2012 | ... Continue Reading.. ... 1 Comment A new image of the Omega Nebula reveals amazing detail in a cosmic landscape of gas clouds, dust and newborn stars.€а Captured by the Very Large Telescope (VLT) at the [ ] . ... Welcome to our annual guide to what the Universe has waiting [ ] . ... The furthest you can travel from home across the [ ] . ... This local school has its own observatory and astronomy club for the students [ ] . ...

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• Astronotes | Armagh Planetarium's astronomy news from across the Universe

Discover the cosmos! ... 2000 December 29 . The Dark Horsehead Nebula . ... Image Processed by Al Kelly . Explanation: While drifting through the cosmos this magnificent interstellar dust cloud, sculpted by stellar winds and radiation, has chanced to assume a recognizable shape. Fittingly named The Horsehead Nebula it is embedded in the immense complex of star forming gas and dust surrounding the Orion Nebula some 1,500 light-years distant. ... About APOD | ...

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• Arcetri Star-Formation Group Publications
• APOD: 2000 December 20 - Sgr A: Fast Stars Near the Galactic Center
• Arcetri Star-formation Group Research Topics

We estimate the conversion factor relating CO emission to H2 mass, ЮБCO, in five Local Group galaxies that span approximately an order of magnitude in metallicityт?? ... We model the dust mass along the line of sight from infrared (IR) emission and then solve for the ЮБCO that best allows a single gas-to-dust ratio (ЮДGDR) to describe each system. ... These results are consistent with the conversion factor becoming a strong function of metallicity around 12 + log (O/H) ~ 8.4-8.2. ...

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• Spatial Variations of Dust Abundances Across the Large Magellanic Cloud
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project.
• Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a

... A faint, dusty rose of the northern sky, emission nebula IC 410 lies about 12,000 light-years away in the constellation Auriga. The cloud of glowing hydrogen gas is over 100 light-years across, sculpted by stellar winds and radiation from embedded open star cluster NGC 1893. ... These "tadpoles" (seen just below center) are regions of denser, cooler gas, and more slowly resist the erosive radiation from the hot stars. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

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... Research . ... High-velocity clouds are not homogeneously distributed across the sky. ... Some of them have been grouped into complexes, including complex L, the complexes in the direction of the Galactic centre (GCP and GCN), or the so-called Wannier clouds (WA WE). ... 1: All-sky map of high-velocity clouds as described below. ... The H i column density map of the HVC sky was finally converted into the Hammer-Aitoff projection which has the advantage of being an equal-area projection. ...

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• Eclipse
• Research - Compact high-velocity clouds around the Milky Way
• Diffuse gas in and around the Milky Way - Programme

... Bringing news from across the Universe to children all around the world . ... It contains billions of awesome objects including planets, dust clouds, galaxies and star clusters like the one in this photograph. ... Charles Messier s life dream was to become famous. To do this, he needed to discover a comet. ... So he decided to save himself some time and each time he found an object that didn t move across the sky (as comets do), he noted it down. ...

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• http://www.eso.org/public/news/eso1151/kids/
• http://www.eso.org/public/news/eso1250/kids/
• Panning across the Lupus 3 dark cloud and associated hot young stars | ESO

. Home . News . Gallery . Events . Twitter . Press Releases . Links . Contact Us . Calendar . Press & Web Coverage . Next . List . The season for noctilucent clouds is not over yet! . More noctilucent coulds photos from Jonathan Bingham: . "I took these at 02.45 on the morning of Saturday 25 July; a bright display aprox 20' across and 10' high. It really caught one's attention." . Monday, 27 July 2009 09:46 . International Year of Astronomy, Ireland National Node . [Back To Top] .

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• Winter Solstice: Sunday 21 December 2008; Ursids Meteor Shower: 18 to 24
• Latest News
• Terry Mosely's Bulletins

This image, obtained during the late commissioning phase of the GeMS adaptive optics system, with the Gemini South AO Imager (GSAOI) on the night of December 28, 2012, reveals exquisite details in the outskirts of the Orion Nebula. ... In this image, the blue spots are clouds of gaseous iron "bullets" being propelled at supersonic speeds from a region of massive star formation outside, and below, this image's field of view. ... Credit: Gemini Observatory/AURA ...

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• December 2015 | Astronomy.com
• Total lunar eclipse, December 21, 2010 | Astronomy.com
• December 2007 | Astronomy.com

... Archive for December 2009 . ... Posted by hlee . ... Category: Algorithms , arXiv , Cross-Cultural , Jargon , Methods , Quotes , Stat , Uncertainty | Comment . ... Category: arXiv , Astro , Stat | ... Comments RSS . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray . ...

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• The AstroStat Slog 2010 December
• The AstroStat Slog Archives
• The AstroStat Slog 2008 December

... In this talk I present a summary of my PhD thesis, which investigates the characteristics, formation and dynamics of filaments arising from wind-cloud interactions. I use magnetohydrodynamic numerical simulations with gas multi-tracking techniques to shed light on the physical mechanisms acting upon wind-swept clouds and provide measurements of the aspect ratios, internal velocity dispersions, energy densities, and magnetic field strengths and orientations in the resulting filaments. ...

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• http://www.mso.anu.edu.au/seminars/abstracts/20151209-1100.html
• http://www.mso.anu.edu.au/seminars/abstracts/20141222-1100.html
• http://www.mso.anu.edu.au/~raquel/5SS-poster.pdf

... Bad Astronomy . ... I think I will break from my usual format of Bad Astronomy/ Good Astronomy by saying that the way we define seasons currently is not strictly bad, but I feel (in my opinion!) that it could be better. The definition of when the seasons begin is at the moment of solstice or equinox; that is, winter (in the north) starts on December 22 nd and summer starts on June 22 nd . ... Now imagine breaking up the Sun's 46 degree up-and-down yearly swing into 1 day intervals. ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy

... Sun images . Magnetic storms online . Sun flares . ... December : 2008 . ... X-ray emission of the Sun from 08.12.2008 to 09.12.2008 (GOES-) . No solar flares of C, M and X-class were observed today . No solar flares of C, M and X-class were observed yesterday . Last updated: December 10, 2008 00:00 UT . ... 1953-2016 Laboratory of X-ray astronomy of the Sun, LPI RAS, Russia . ... 7(499)132-65-96, Fax: +7(499)132-65-97 . ...

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• Solar flares online December 12, 2007
• Solar flares online December 13, 2008
• Solar flares online December 10, 2008

... The high angular resolution CGPS images of atomic hydrogen emission reveal a wide-spread, cold atomic hydrogen component of the interstellar medium in the form of dark self-absorption cloud complexes. These clouds resemble molecular cloud complexes in structure and trace the spiral arm structure of the Galaxy. ... Nevertheless, continuum absorption studies show that some of the cold atomic hydrogen clouds have temperatures as low as 15 - 20 K --- similar to dense molecular clouds. ...

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• Current Research Projects
• What is HISA?
• The Pleiades

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 . ...

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• NOVAC Newsletter - Reflections On 1982 - an Astronomy Net Article
• Astronomy articles, forums, listings, and other resources about Astronomy.

... Sun-aligned arcs are auroral features found within the polar cap , as opposed to the auroral oval where the more typical arcs reside. First global image of this phenomenon was reported by Frank et al. (1982); it consists of luminous belt reaching across the polar cap from noon to midnigh (that is why it is also called theta aurora; terms transpolar or polar cap arc are also known). ... Res., ... Antisunward decay of polar cap arcs, J. Geophys. ... The Creation of Theta-Aurora, by JHU/APL . ...

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• The Wind Spacecraft
• Galileo to Jupiter
• Galileo Mission Status - December 10, 1995

ECLIPSES, TRANSITS OF MERCURY AND VENUS . Year 1999 . Year 2000 . Year 2001 . Year 2002 . Year 2003 . Year 2004 . Year 2005 . ... Total solar eclipse . ... Transit of Mercury across the solar disk . ... Total lunar eclipse . ... Partial solar eclipse . ... Partial lunar eclipse . ... Annular solar eclipse . ... Penumbral lunar eclipse . ... big map . ... Transit of Venus across the solar disk . ... Annular-total solar eclipse . ... Non-central annular solar eclipse . ...

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• Calendar_December

... Home Observing Solar Bridge Across New York Harbor . ... Clear Sky Chart . This Month's Sky . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Amateur Astronomers Medal . ... Get on board with the Amateurs Astronomers Association, Sunday, September 20th, 2015 . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

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• Astro Imaging Workshop: Planetary Astro Imaging with a DSLR ? December 7, 2014
• Lecture Series 2015-2016 ? Amateur Astronomers Association of New York

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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• QSO Absorption Lines and Other Cosmological Probes
• Historical Weather Anamolies: Nov-Dec
• University of Oregon Center for High Energy Physics - Recent Experimental Talks