... Cataloged as NGC 2359, the striking nebula is located about 15,000 light-years away in the constellation Canis Major. Venus Just After Sunset . ... About one year ago the robotic Huygens probe landed on the enigmatic moon of Saturn and sent back the first ever images from beneath Titan's thick cloud layers. NGC 1999: South of Orion . ... If you can find Saturn in tonight's sky, then you can also find M44, popularly known as the Beehive star cluster. ... An Unusual Two Toned Rock on Mars . ...

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... Armagh Planetarium . ... Our Galaxy . ... Universe . ... For those of you that are still bearing the psychological scars from PlutoтАЩs demotion from planet to dwarf planet a decade ago, here is news that may add salt to [ ] . ... In 2015 Armagh PlanetariumтАЩs website (including Astronotes) received well over 2.6 million page views (and over 75 million web hits*) from all over the world. ... Here you will find the latest news and views from the fascinating worlds of astronomy and space exploration....

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• stellar nursery | Astronotes
• December Night Sky Wonders | Astronotes
• Astronotes | Armagh Planetarium's astronomy news from across the Universe -

... 2014 December 3 . Sharpless 249 and the Jellyfish Nebula . ... In fact, the cosmic jellyfish is part of bubble-shaped supernova remnant IC 443 , the expanding debris cloud from a massive star that exploded . ... Like its cousin in astrophysical waters the Crab Nebula supernova remnant, the Jellyfish Nebula is known to harbor a neutron star, the remnant of the collapsed stellar core. An emission nebula cataloged as Sharpless 249 fills the field at the upper left. ... About APOD | ...

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• APOD: 2006 December 9 - Three Planets in Dawn Skies
• APOD: 2014 December 2 - Eta Carinae and the Expanding Homunculus Nebula
• APOD: 2013 December 5 - Planetary Nebula Abell 7

... Tonight's Sky . ... The Magazine . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Bright planets meet at dusk . ... Astronomy magazine subscribers can read the full article for free. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter....

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• Astronomy Magazine - Interactive Star Charts, Planets, Meteors, Comets,
• Jupiter brightens the December sky | Astronomy.com
• Animations of icy planet formation | Astronomy.com

An excellent opportunity arises over the Christmas period for a rare view of the planet Mercury, just above the south-western horizon at dusk. ... On Christmas Day, Mercury, the solar system's innermost planet, will shine at magnitude -0.7, about as bright as the brightest stars, while both Jupiter and Venus will be brighter still. Mercury will reach greatest eastern elongation, that is, greatest angular distance from the Sun, on January 4th. ... Last Revised: 2009 January 5th . ...

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• Featured Image | International Year of Astronomy in Ireland | Astronomy 2009
• Geminid Meteors
• Christmas Moon over Armagh | International Year of Astronomy in Ireland |

... Articles | ... Forums . ... 230 deg . 49 deg . ... 130 deg . ... More Info . ... 210 deg . ... 168 deg . ... 249 deg . ... 195 deg . ... 271 deg . ... 110 deg . ... 338 deg . ... July 15 . 247 deg . ... 224 deg . ... 340 deg . ... July Phoenicids (PHE) . ... August 10 . 341 deg . ... 339 deg . ... 307 deg . ... 334 deg . ... 335 deg . ... 286 deg . ... 327 deg . ... 262 deg . ... 102 deg . ... 153 deg . ... 117 deg . ... December 2 . ... 123 deg . ... 100 deg . ... www.astronomy.net . ...

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• Blue Moon, What Is It? - an Astronomy Net Article
• Articles written by astronomers for astronomers of all ages.
• The Astronomy Shop - Cards - by Astronomy Net

... 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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• ESO - Newsletter December 2015
• Los Cielos de Am , The darkest sky and the two galactic hemispheres
• Popular Astronomy

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• Astronomy Plus CCD Images of Galaxies
• Astronomy HyperText Book: Interstellar Medium
• Low Surface Brightness Galaxy Gallery

... 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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• Planetary Radar: Arecibo Radar Images of Planets
• Extra-solar planets

... STScI-PRC97-38b HUBBLE'S PLANETARY NEBULA GALLERY [Top left] - IC 3568 lies in the constellation Camelopardalis at a distance of about 9,000 light-years, and has a diameter of about 0.4 light-years (or about 800 times the diameter of our solar system). ... Credits: Howard Bond (Space Telescope Science Institute), Robin Ciardullo (Pennsylvania State University) and NASA [Top center] - NGC 6826's eye-like appearance is marred by two sets of blood-red "fliers" that lie horizontally across the image. ...

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• APOD: 2000 December 29 - The Dark Horsehead Nebula
• APOD: December 17, 1996 - Mariner's Mercury
• APOD: December 8, 1996 - Degas Ray Crater on Mercury

... 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: Mad Science
• Phil Plait's Bad Astronomy: Misconceptions
• Phil Plait's Bad Astronomy: Bitesize Tour of the Solar System

... In typical nightly use, the wide field and planetary telescope and cameras record images of favorably placed objects in the sky, including constellations, bright variable stars, nebulae through narrow-band filters, comets, the Moon, and planets. ... Shared Skies telescopes are available for use by students at the University of Louisville and the University of Southern Queensland, and by teachers and students in middle and high schools mentored by faculty at the universities. ...

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• AstroCC - A Coordinate Converter for Astronomy

... 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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• Flux density bootstrapping
• December 2013 ATUC meeting agenda and supporting documents
• December 2005 ATUC meeting agenda and supporting documents

... Solar System Data . Tables of many physical and orbital parameters for each of the major bodies in the solar system. ... Lists of the biggest, smallest, brightest and densest bodies in the solar system and a list of those bodies least unsuitable for life. ... Lists of which bodies were discovered in each century since Galileo. ... Some interesting linguistic tidbits relating to the planets. ... Astronomical Names . ... The sites around the Net where The Nine Planets is located. ... Appendices .. ...

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• Galileo Mission Status - December 10, 1995
• The Acceleration of the Aurora
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Transiting Exoplanet Survey Satellite Principal Investigator: Dr. George R. Ricker, MIT NASA EXPLORER MISSION, SCHEDULED TO LAUNCH IN 2017: An All-Sky Survey for Exoplanets Transiting Nearby Stars TESS SCIENCE OBJECTIVES DISCOVER TRANSITING EXOPLANETS ORBITING NEARBY, BRIGHT STARS The NASA Kepler Mission showed that planets are abundant throughout the Galaxy, but most of the Kepler planets orbit stars too distant and dim for further study. ...

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• XO Project
• HST this week: 357
• HST this week: 358

... 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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... Planets and Brown Dwarfs . ... Mission Definition . Ask anyone on the street to give an example of a planet, and they'll consider you a bit dim. ... Finally, if you ask "What is the exact scientific definition of 'planet'?", it turns out that nobody can answer it, because there really isn't one. ... The word itself means "wanderer" in Greek, and other cultures generally have words for "planet" with a similar meaning. So why isn't that good enough for us today? ...

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• ASP: Education Newswire
• ASP: Taking a Grand Virtual Voyage in the Milky Way
• ASP: Public Lectures

... Aurora from Space . ... Magnetic Storms . ... The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... Why no aurora at the magnetic poles? ...

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• The Wind Spacecraft
• The Brightest Moon
• Space Research Institute (IKI) Seminar

ARCSAT ID NUMBER: AS01 DESCRIPTIVE TITLE: Search for Short-Period Planets Orbiting Bright White Dwarfs PI: Brett Morris (UW) OBSERVER(S): Brett Morris (UW), Doug Branton (UW) UNCERTIFIED/UNTRAINED OBSERVERS: Undetermined Pre-MAP students ... In addition, since typical white dwarfs are roughly Earth-sized, the transit of an Earth-sized planet can cause changes in brightness on the order of several tens of percent for durations on the order of one minute (Agol 2011). ...

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• http://www.apo.nmsu.edu/Telescopes/ARCSAT/ObsSchedules/arcsat_oct2014/AS03.html
• http://www.apo.nmsu.edu/Telescopes/ARCSAT/ObsSchedules/arcsat_may2015/AS04.html
• http://www.apo.nmsu.edu/Telescopes/ARCSAT/ObsSchedules/arcsat_apr2016/AS05.html

Class 1 Introduction, Background History of Modern Astronomy The Night Sky, Eclipses and the Seasons Kepler's Laws Newtonian Gravity General Relativity Matter and Light Telescopes Class 2 Solar System Characteristics Formation Exosolar Planets Class 3 Stars The Sun Stellar Evolution of Low and High Mass Stars Deaths of Stars Exotic Stars Class 4 Galaxies Galaxy Classification Formation of Galaxies Galactic Evolution ... So far, one planet has been studied by this method. ...

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• This MonthтАЩs Sky тАУ February 2016 ? Amateur Astronomers Association of New
• Best Celestial Events of 2006 ? Amateur Astronomers Association of New York
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