... 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 2010 . ...

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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: 2006 December 27 - IC 5067: Emission Nebula Close up
• APOD: 2006 December 8 - NGC 2174: Emission Nebula in Orion

... 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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• stellar nursery | Astronotes
• 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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• APOD: 2000 December 20 - Sgr A: Fast Stars Near the Galactic Center

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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... 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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... Tonight's Sky . ... Moon . ... Observing . ... Astronomy for Kids . ... Total lunar eclipse, December 21, 2010 . The first total eclipse of the Moon in nearly 3 years occurs the night of December 20/21. ... The totally eclipsed Moon December 20/21 lies in Taurus the Bull, near its order with Orion and Gemini. ... If you are already registered on Astronomy.com, please log in below. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

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• December 2007 | Astronomy.com
• December 2015 | Astronomy.com
• December 2012 | Astronomy.com

... R. Michael Rich, University of California - Los Angeles . HST Imaging of UV emission in Quiescent Early-type Galaxies . Abstract . ... The Difference Between Neutral- and Ionized-Gas Metal Abundances in Local Star-Forming Galaxies with COS . ... Since then, there have been numerous other observations, including Hubble's images of proplyds (protoplanetary disks) in the Orion Cluster, and Hubble and Spitzer observations of edge-on disks in other young stars. ... Past weeks: . ...

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• HST this week: 343
• HST this week: 350
• December 2011

... The Tarantula Nebula , also known as 30 Doradus and NGC 2070 , is a large region of ionized gas surrounding a collection of newly-forming stars at the eastern end of the stellar bar in the Large Magellanic Cloud (many similar regions are scattered through the LMC; see Kennicutt et al. ... The false-color image above is a log-scale display of a mosaic of several images taken with a CCD camera on the 0.6m Curtis Schmidt telescope at Cerro Tololo Inter-American Observatory in December 1994. ...

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• The Pleiades
• Current Research Projects
• M42 Color Images

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Survey Telescopes . ... Images . ... Usage of ESO Images and Videos . ... Usage of ESO Videos and Images . ... ESO Science Newsletter . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... VST . ... The spectacular star-forming Carina Nebula has been captured in great detail by the VLT Survey Telescope at ESOтАЩs Paranal Observatory. ... Carina Nebula . ...

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• ESO - Newsletter December 2015
• Panning across the VISTA infrared view of the Orion Nebula | ESO
• Panning across a VST image of the Carina Nebula | ESO Ireland

... 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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... 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

... WINTER SOLSTICE. The Sun reaches its maximum Southerly declination on December 21d 12h 04m, so if you see it transit at local noon that day it will be just about as far South in the sky as it crosses the meridian as it can ever be. ... The next shower is the Ursids , with a radiant not far from Kocab, or Beta Ursa Minoris. ... Friday, 19 December 2008 01:32 . International Year of Astronomy, Ireland National Node . ...

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• Featured Image | International Year of Astronomy in Ireland | Astronomy 2009
• Armagh Observatory
• ESO and the EELT: Tue 15 December, DCU, Dublin | International Year of

Having studied the solar corona and its radio emissions sunspot cycles ago, I was keen to verify its existence optically during the total solar eclipse of Wednesday, 4 December 2002, the first on Australian soil since 1976. The moon's shadow was to travel from the south-Atlantic west of The Congo, across southern Africa, the Indian Ocean and into the Great Australian Bight, finally making Australian landfall at Ceduna, South Australia (SA). ... The favoured site to observe the eclipse was Ceduna. ...

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• ATNF Media Release - December 1, 1998
• Pulsar Group Main/Visitors
• Planetary_nebula

In this presentation I will recap what we know about the dwarf planet Pluto its companion moons, including some recent results from the Division of Planetary Sciences October 2014 meeting (Tucson, AZ). Next I will describe NASA s New Horizons mission, launched in January 2006, who has been traveling across the solar system and will reach the Pluto system in July 2015. ... I will end the presentation with the latest news from the New Horizons mission and its plans after the July 2015 Plutoflyby. ...

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• http://www.mso.anu.edu.au/~raquel/5SS-poster.pdf
• http://www.mso.anu.edu.au/seminars/abstracts/20141201-1400.html
• Emma Kirby

... 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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... 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 Mission Status - December 10, 1995
• Galileo to Jupiter

http://hubblesite.org/newscenter/archive/releases/1996/22/text/ Probing the mysterious heart of the Crab Nebula, the tattered remains of a stellar cataclysm witnessed more than 900 years ago, astronomers using NASA's Hubble Space Telescope have found that the Crab is even more dynamic than previously understood, based on a cosmic "movie" assembled from a series of Hubble observations. ... Because of this flickering, the neutron star is also called a "pulsar." ...

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• http://www.astro.louisville.edu/software/xmtel/archive/xmtel-5.1/BUGS

. All images Copyright by Vasiliy V. Rumyantsev , 1998 . For personal viewing only. If you have any questions or suggetions or if you want to use these images contact me . Page created: 28 December 1998 . Last update: 23 Sept. 1999 .

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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