... IC 4406: A Seemingly Square Nebula . ... How can a round star make a square nebula? ... Like a butterfly, a white dwarf star begins its life by casting off a cocoon that enclosed its former self. ... A massive star ends life as a supernova, blasting its outer layers back to interstellar space. ... Three Dusty Stars . ... These separate radio images reveal three dusty debris disks surrounding three bright, young, nearby stars - evidence for solar systems in formation. ... Water From Orion . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2001 December 25 . Star Forming Region Hubble-V . ... Hubble Heritage Team , NASA . ... Inspection of NGC 6822 shows several bright star groups, including two dubbed Hubble-X and Hubble-V. Pictured above , the Hubble Space Telescope has resolved Hubble V into the energetic stars that are lighting up the surrounding gas. ... About APOD | ...

... 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....

... HST . ... Data . ... HST Overview . Overview . ... Retrieving HST Data . ... This FORM is a quick tool for flux conversion between diverse unit systems. ... INPUT FLUX or MAGNITUDE UNITS CLEAR Jy W/m2/Hz W/m2/um W/cm2/um erg/cm2/s/Hz erg/cm2/s/A photons/m2/w/um photons/cm2/s/A AB magnitude magnitude V magnitude U magnitude B magnitude R magnitude I magnitude J magnitude H magnitude K magnitude L magnitude L1 magnitude M magnitude N magnitude Q . ... Enter the Input Flux or Magnitude Value : . ...

... International Year of Astronomy in Ireland . ... Christmas Moon", painting by Miruna Popescu, Armagh Observatory, featured as " Lunar photo of the Day " and " Astronomy Sketch of the Day " on 25 December 2009. ... To mark the 400th anniversary of GalileoтАЩs first use of the telescope to observe the sky, 2009 has been celebrated worldwide as the International Year of Astronomy. Moon over Armagh - link to Astronomy Sketch of the Day on 25 December 2009 . ... Monday, 11 May 2009 23:54 . ...

... STScI-PRC00-10 "HUBBLE TAKES A CLOSE-UP VIEW OF A REFLECTION NEBULA IN ORION" Just weeks after NASA astronauts repaired the Hubble Space Telescope in December 1999, the Hubble Heritage Project snapped this picture of NGC 1999, a nebula in the constellation Orion. ... NGC 1999 is an example of a reflection nebula. ... The star is so young that it is still surrounded by a cloud of material left over from its formation, here seen as the NGC 1999 reflection nebula. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Stars . ... Monthly Sky Notes . ... This month Jupiter the largest of all planets, remains visible in the sky after sunset, not setting until after 11pm.€а On the evening of 12and 13 December the bright star-like object close to the Moon will be this gas giant planet. ... Rising this month is the great winter constellation of Orion the Hunter who will remain in our night sky through until March. ... Tweets that mention Wonders of the December Sky | ...

... STScI-PRC95-45a CRUCIBLE OF CREATION: PANORAMIC HUBBLE MOSAIC ZOOMS IN ON MAELSTROM OF STAR BIRTH This spectacular color panorama of the center the Orion nebula is one of the largest pictures ever assembled from individual images taken with NASA's Hubble Space Telescope. ... Though this 2.5 light-years wide view is still a small portion of the entire nebula, it includes almost all of the light from the bright glowing clouds of gas and a star cluster associated with the nebula. ...

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 . ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Survey Telescopes . ... Star Clusters . ... FLAMES . ... 100 Hours of Astronomy . ... IMAX€о 3D Film Hidden Universe . ... This image, the first to be released publicly from VISTA, the worldтАЩs largest survey telescope, shows the spectacular star-forming region known as the Flame Nebula, or NGC 2024, in the constellation of Orion (the Hunter) and its surroundings. ...

... Gallery . ... Wide Field Survey Images . Miscellaneous Wide Field Images . Orion Nebula by the Hubble Space Telescope . Sidebar Left . Sidebar Top . ... Title: Orion Nebula by the Hubble Space Telescope . Description: NOTE: All images are copyright and must not be reproduced or mirrored in any form without written permission. ... Orion Nebula by the Hubble Space Telescope NOTE: All images are copyright and must not be reproduced or mirrored in any form without written permission. ...

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. ...

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. ...

... Dept. for Astrometry & Space Geodynamics . ... Dept. for Physics of Stars&Galaxies . ... Dept. for Physics of Planetary Systems . ... Science . ... All Pages . ... Research of the stars with planets which pass apparent star disk (transiting exoplanets). The transit method based on a detection star brightness decrease during a passing of planet in front of its disk. Observed brightness system decries when planet pass star disk and its volume depend of the relative sizes star and planet. ...

National Aeronautics and Space Administration . ... Carl E. Walz (Colonel, USAF, Ret.) NASA ASTRONAUT (FORMER) . ... NASA EXPERIENCE: Selected by NASA in January 1990, Walz is a veteran of four space flights, and has logged a total of 231 days in space. He was a mission specialist on STS-51 (1993), was the Orbiter flight engineer (MS-2) on STS-65 (1994), was a mission specialist on STS-79 (1996), and served 196 days in space as flight engineer (FE-1) on ISS Expedition-Four (2001-2002). ...

... Jupiter. ... The time in the table is the mean solar time for the Almaty time zone. ... Almaty and Cholpon-Ata are in the same time zone. h 25 h 36 h 00 h 12 h 24 h 36 h 48 h 12 h 48 m (February 28) m m m m m m m m (March 1) m m m m m m m m m m m m m m m m m m m m 14.92 15.08 15.41 15.44 15.37 15.12 14.92 14.89 14.80 14.78 14.80 14.82 14.85 14.96 14.72 14.72 14.63 14.65 14.77 14.84 15.10 15.43 15.32 15.05 14.90 14.75 14.73 14.70 Bishkek ­ Cholpon-Ata , Kyrgyzstan ...

ATCA flux density scale at 12mm R.J. Sault 7 December 2003 The flux of PKSB1934-638 at centimetre wavelengths has been well-studied by Reynolds (1994), and is in routine use as the primary flux density reference for the ATCA. ... With the installation of receivers at the ATCA which operate in the 16-25 GHz window, there is a clear need for a flux density scale in this band. ... The data were measured as part of pro ject C1225 and as special observations to determine the flux density of 1934-638. ...

... V838 Mon is a member of a new class of eruptive variables which appear as a peculiar novae having late K-M type spectra in their outburst. Before its outburst, it was a wide binary system of B3V type stars. ... The B3V companion was seen in the outburst in the UV spectrum taken with HST (Rauch et al., ... In the latest spectra, the light of B3V companion was predominating in the short-wave photometric bands. ... CCD blue frames of V838 Mon before the eclipse (left) and in the eclipse (right). ...

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Slacker Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Life Under the Moon . ... Seeing Jupiter's Moons . ... Time Zones and the Spherical Earth . A Companion to the Earth? ... December 19, 1999) . ... Big Moon, Little Moon . ... How Big is the Moon? ... 14, 2000) . ... 2008 Phil Plait. ... Subscribe to the Bad Astronomy Newsletter! Talk about Bad Astronomy on the BA Bulletin Board! ...