Astronomy Picture of the Day . ... Apollo 12 Visits Surveyor 3 . ... Fliers Around the Blue Snowball Nebula . ... Planetary nebulae are strange. ... Next, although hundreds of planetary nebulae have been catalogued and thousands surely exist in our Galaxy, aspects of the formation process are still debated. The Blue Snowball Planetary Nebula . ... The Blue Snowball is a planetary nebula - and in 5 billion years the Sun will throw off its outer layers and go through a planetary nebula phase. ...

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... 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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... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to Guesthouse . ... Survey Telescopes . ... This video fades back and forth between views of the stellar nursery Monoceros R2 in visible and infrared light. The visible-light view was created from digitised photographs through red and blue filters forming part of the Digitized Sky Survey 2 (DSS) and the new infrared view comes from the VISTA telescope at Paranal. ...

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• Infrared/visible crossfade of the CatтАЩs Paw Nebula | ESO
• Infrared/visible crossfade of the Orion Nebula | ESO
• Detecting Metals in Invisible Galaxies | ESO

Astronotes Armagh Planetarium's Stellar Blog! ... Meteors and Meteorites . ... Stars . ... Monthly Sky Notes . ... This famous depiction of the Leonids was based on a first hand account of a meteor storm by a minister, Joseph Harvey Waggoner. ... In the autumn the Great Square of Pegasus is visible in the southern night sky. ... I hope this guide to the November night sky is helpful and have fun star sight-seeing! ... Tweets that mention The Leonid meteors: highlights of the November night sky | ...

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• Dark matter and dark energy: the deepest mysteries in astronomy | Astronotes
• What is a nebula? | Astronotes
• Stellar Nursery NGC 6357: Image of the Month | Astronotes

... November 17, 1996 . A Quasar in the Gamma-Ray Sky . Credit: EGRET team, Compton Observatory , NASA . Explanation : The bright object in the center of the false color image above is quasar 3C279 viewed in gamma-rays , photons with more than 40 million times the energy of visible light. ... Yet, in June of 1991 a gamma-ray telescope onboard NASA's orbiting Compton Gamma Ray Observatory unexpectedly discovered that it was one of the brightest objects in the gamma-ray sky . ... About APOD . ...

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• APOD: December 26, 1998 - Gamma Ray Quasar
• Types of Nebulae
• APOD Index - Miscellaneous: Quasars

... STScI-PRC00-12 THE GLOWING EYE OF NGC 6751 Astronomers using NASA's Hubble Space Telescope have obtained images of the strikingly unusual planetary nebula, NGC 6751. Glowing in the constellation Aquila like a giant eye, the nebula is a cloud of gas ejected several thousand years ago from the hot star visible in its center. ... The nebula shows several remarkable and poorly understood features. ... Hajian and his team are scheduled to reobserve NGC 6751 with Hubble's WFPC2 in 2001. ...

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• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/ISM/NGC3132.txt
• GIANO opens a new window on stellar and planetary astrophysics
• Arcetri Library Classification System

... GAMMA RAY BURSTS . with guest Dr. Dale Frail from National Radio Astronomy Observatory . ... Gamma-Ray Bursts . A Collection of Resources to Get Behind the Headlines . Andrew Fraknoi (Foothill College & ASP) . ... This is a fine introduction to violent events in the universe by a noted astronomer, with a good section on gamma-ray bursts. ... On the Swift mission and what it is teaching astronomers about gamma-ray bursts. ... http://imagine.gsfc.nasa.gov/docs/science/know_l1/bursts.html . ...

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• ASP: Planetary Nebulae: Shrouds of Mystery
• ASP: Beacons in the Gloom
• ASP: More About Deep Space Objects and Cosmic Terms

... Towards a Truly Unified Model of AGN . ... The Unified Model holds that the aspect-dependent effects primarily determine the nature of the active galactic nucleus that we observe. ... The full postscript file can be obtained here: . The PASA Latex file can be obtained here: . The postscript file of Fig 1 can be obtained here: . ...

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• The Music of the Spheres
• Showcase
• GSAOI Magellanic Cloud Planetary Nebulae Science Page

One of my areas of interest in astronomy is the study of planetary nebulae (hereafter PN or PNs). The name is a historical artifact, reflecting that in the telescopes of the late 18th century these various of these objects looked round and pale green in colour similar to Uranus in appearance. ... A collection of pictures of PNs is available at Bruce Balick's Planetary Nebula Image Calalogue page . ... The very nice HST image of the Ring Nebula below is a case in point. ...

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• HST this week: 029
• HST this week
• HST Call for Proposals

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . The lunar phase (nearly new) will be perfect and the encounter with the 1866 trail, reinforced by the presence of the 1699 trail, should produce the most spectacular display during the various years around the current return of Comet 55P/Tempel-Tuttle. ... The secondary peak, due to the 1767 trail, will be visible from the Americas. ... Go to Armagh Observatory Leonid page . Last Revised: 2009 November 10th . ...

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• Leonids in 2002
• Hydrogen-deficient central stars of planetary nebulae
• May 2002 Planetary Alignment

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... Meade Series 4000 Nebular Filters incorporate the very latest in interference coatings technology. ... Technical Basis of the Meade Broadband Nebular Filter: As shown in the transmission graph below, the Meade Broadband Nebular Filter strongly rejects the light of sodium- and mercury-vapor lights as well as natural airglow and auroral emissions. ... Meade Series 4000 Narrowband Nebular Filters . ... Meade Series 4000 Oxygen-III Nebular Filters . ... Meade Series 4000 Photo-Visual Color Filters . ...

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... Stellar Evolution . Nucleosynthesis in Stars . The Evolution of Star Clusters . JAVA Physics Lab . Alternative Energies Class . Steve Kevan's Physics 251 Class . ... Talk on Solid State Physics of CCD detectors . Talk on Cosmological Issues . ... Digital Spectra of Stars . NETexperts E-mail List . The Electronic Universe Project e-mail: nuts@moo.uoregon.edu ...

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• Lecture IV.
• U of O High Energy Physics Seminars
• Astro-2 and the UIT Experiment

Cosmic rays are not the only sign of high energy particles in the distant universe. Additional evidence comes (like most astronomical data) from visible light and other types of electromagnetic waves , e.g. x-rays and radio waves. ... Photons of visible light have about 2 electron volts (ev), while medical x-ray photons may have energies of 50,000 ev and those of gamma rays reach 1,000,000 ev and even more. ... To produce x-rays or gamma rays, electrons must collide with something. ...

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• Solar Energetic Particles
• Magnetospheres and the Universe
• Spacecraft Observing the Sun and the Heavens above

... Bad Astronomy . ... On Thursday, February 15th 2001 (and replayed on March 19), the Fox TV network aired a program called ``Conspiracy Theory: Did We Land on the Moon?'', hosted by X-Files actor Mitch Pileggi. ... Dust around the lander . ... However, it appeals to our common sense: when the sky is black here on Earth, we see stars. ... Bad: The program claims that when the top half of the lander took off from the Moon to bring the astronauts back into orbit, there was no flame from the rocket. ...

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• Phil Plait's Bad Astronomy: Bitesize Astronomy
• Phil Plait's Bad Astronomy: Info

... galaxies: bulges galaxies: clusters: general galaxies: clusters: individual: . ... star formation statistics stellar content structure Cosmology ( cosmology :) cosmic background radiation ( cosmology :) cosmological parameters cosmology : miscellaneous cosmology : observations cosmology : theory ( cosmology :) dark ages, reionization, first stars ( cosmology :) dark energy ( cosmology :) dark matter ( cosmology :) diffuse radiation ( cosmology :) distance scale ( cosmology :) early Universe (...

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• GRB080319B
• Study of radio spectra and variability of GPS sources

Next: Objects without emission lines Up: Results of follow-up spectroscopy Previous: Selection effects . QSOs with strong emission lines might be selected in our sample if either the Ly 1216 ? line redshifted to z 3 or the Mg II 2798 ? ... This produces an easily visible emission peak on the digitized prism spectra even for very faint objects ( B ) which is usually hard to distinguish from low-redshifted [O III ] features. ... emission line shifted to a wavelength near 4000 ?. ...

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• Strasbourg-ESO Catalogue of PNs in NVSS
• Photek UV-X-gamma-Beta and Particle Imaging Systems
• HyperLEDA documentation: parameter: vdis

Subject, Problems and Objects of Theoretical Astrophysics. ... Stellar Photospheres, Their Features. ... Physics of Continuous Radiation Absorption in Stellar Photospheres. ... Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. ... Characterisics of Absorption Lines. ... Interstellar Absorption Lines, Their Features. ... Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. ...

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• Extragalactic Astronomy
• Introduction to Astronomy
• Spherical and Practical Astronomy

... X-rays are made up of photons that are emitted from stars, or quasars, or supernovae, the sun, or simply: anything that is undergoing a change either in size or temperature or giving out heat. ... in an X-ray binary star system, in which one normal star's orbit is crossed by a neutron star, when the neutron star by means of gravitational pull takes matter from the normal star X-rays form. ... Artists conception of a normal star (HDE 226868) and a black hole taking matter from the normal star. ...

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• Martin Elvis' Research - Quasar SEDs
• High Energy Astrophysics
• An Annotated Quasar SED

Stellarium 0.12.3 . ... Classes . ... StelGui Class Reference . Main class for the GUI based on QGraphicView. ... voidљ . setFlagShowFlipButtons (bool b) . ... getAutoHideHorizontalButtonBar () const . Get the auto-hide status of the horizontal toolbar. ... virtual voidљ . ... virtual void StelGui::forceRefreshGui . ... Get the button bar of the left of the screen. virtual void StelGui::init . ... returns true if the gui has complted init process. virtual bool StelGui::isCurrentlyUsed . ...

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• Stellarium: Quasars Class Reference
• Stellarium: ScreenImageMgr Class Reference