Astronomy Picture of the Day . ... Well don't feel bad - this even happened to the bright young stars of the open cluster NGC 6520. On the left are the cluster's bright blue stars. They formed only millions of years ago - much more recently than our ancient Sun which formed billions of years ago. ... Information: Thursday, September 26 - A Total Lunar Eclipse . ... September . ... September 1996 . ... Publications with keywords: clouds - stars . Publications with words: clouds - stars . ...

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• XWare > APOD

... 2014 October 8 . NGC 6823: Cloud Sculpting Star Cluster . ... Explanation: Star cluster NGC 6823 is slowly turning gas clouds into stars. ... Some outer parts of the cluster, visible in the featured image 's center as the stars and pillars of emission nebula NGC 6820 , contain even younger stars. ... Open star cluster NGC 6823 spans about 50 light years and lies about 6000 light years away toward the constellation of the Fox ( Vulpecula ). APOD Wall Calendar: Nebulas and Star Clusters . ...

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• APOD: 2004 October 4 - NGC 6823: Cloud Sculpting Star Cluster
• APOD: 2001 February 7 - Distant Open Cluster M103
• APOD: January 27, 1996 - Open Cluster M8 in the Lagoon

Astronotes Armagh Planetarium's Stellar Blog! ... Comets and Asteroids . ... Image credit:ESO/J.Emerson/VISTA. ... However others are less pessimistic and it has even been claimed that the mysterious ?Wow! signal? received in 1977 originated from the direction M55.б  Sadly, this still unexplained pulse of radio energy originated from a location rather to the northwest of M55 so I doubt if the source was this cluster (if indeed the signal was genuinely of extraterrestrial origin). ... Mysterious Wow! ...

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• NGC4666: Secrets of a Starburst Galaxy | Astronotes

... STScI-PRC00-25 A DYING STAR IN GLOBULAR CLUSTER M15 The globular cluster Messier 15 is shown in this color image obtained with the NASA Hubble Space Telescope's Wide Field Planetary Camera 2 (WFPC2). ... Known as Kuestner 648, this was the first planetary nebula to be identified in a globular cluster. ... At the present time, the most massive stars remaining in M15 have about 80 percent of the mass of our Sun, a fact that makes the existence of a planetary nebula like K 648 something of a mystery. ...

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• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/ISM/ghostly.txt
• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/Galassie/9821.txt
• A Search for Clustering around Herbig Ae/Be Stars

GALAXIES cenA .tiff 40 Bright Radio Galaxy M31.tiff Nikon Andromeda Galaxy (note HII regions in spiral arms) ngc6744.tiff 40 NGC 6744 a face-on spiral clouds_20d.tiff H'blad The Magellanic Clouds our nearest neighbours Lmc_7.tiff Nikon The Large Magellanic Clouds Lmc_zoom.tiff Nikon Detail of previous image smc_7.tiff Nikon The Small Magellanic Clouds smc-zoom.tiff Nikon Detail of previous image 30dor_40_BVR.tiff 40 The 30 Dor ... B [OIII] Halpha trifid.tiff 40" The Trifid Nebula. ...

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• http://www.mso.anu.edu.au/seminars/abstracts/20150220-1400.html
• Blue Straggler Stars
• GSAOI Orion Nebula Cluster Science Page

An eight-billion-year-old cluster of stars 13,000 light-years from Earth, called NGC 6791, can be seen in the image. ... This particular cluster is called an open cluster, because the stars are loosely bound and have started to spread out from each other. The area pictured is 0.2 percent of Kepler's full field of view, and shows hundreds of stars in the constellation Lyra. The image has been color-coded so that brighter stars appear white, and fainter stars, red. ...

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B5A2205F0-B55C-4F9E-8468-8FB79738A187%7D
• An older open cluster takes a turn in the spotlight | Astronomy.com
• Life and death in a star-forming cloud | Astronomy.com

... Bad Astronomy . ... Bitesize Astronomy . ... The next step up are true clusters, called open clusters . Open clusters (sometimes misleadingly called "galactic clusters") are groups of stars ranging in size from a few dozen stars up to tens of thousands. ... The youngest is about 1 or 2 million years old, while the oldest is about 6 or 7 billion years, making it just older than our own solar system. ... So by looking at the stars in the cluster we can tell pretty well how old they are. ...

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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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• Low Surface Brightness Galaxy Gallery
• Astronomy HyperText Book: Stellar Clusters
• Astro-2 and the UIT Experiment

... All previous such superstars have been found along with many companion stars in the centres of crowded star clusters. The star is known as VFTS 682 from the VLT-FLAMES Tarantula Survey catalogue of the European Southern Observatory's Very Large Telescope (VLT) located at Paranal in Chile by means of the attached FLAMES instrument. ... Although VFTS 682 seems to be alone now it is not very far away from a very rich star cluster known as RMC 136 that contains several similar superstars. ...

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• William Herschel
• M.D. Smith, Research Astronomer
• Stars Beyond Maturity

... 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. ...

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• http://www.naic.edu/~astro/frontiers/NewScieComa_Apr07.pdf
• The Pleiades

... ESO, the European Southern Observatory . ... ESO . ... Galaxy Clusters . ... Star Clusters . ... This image from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESOтАЩs La Silla Observatory in Chile, shows the bright star cluster NGC 6520 and its neighbour, the strangely shaped dark cloud Barnard 86. This cosmic pair is set against millions of glowing stars from the brightest part of the Milky Way тАФ a region so dense with stars that barely any dark sky is seen across the picture. ...

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• The hidden fires of the Flame Nebula* | ESO
• Panning across the star cluster NGC 6520 and the dark cloud Barnard 86 | ESO
• Zooming in on the bright star cluster NGC 3293 (fulldome) | ESO

Note that different students may see different quiz forms.) ... Giant stars are rare because . a) they do not form as often as main sequence stars. b) giant stars are unstable. c) the giant stage is very short compared to the main sequence stage. d) elements heavier than helium are relatively rare. In a color-magnitude diagram of a star cluster, the blue end of the main sequence is useful for defining the age of the cluster because . ... 2) Some idea. 3) Good idea. ...

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• Reading Quiz PAUL J. GREEN - ConcepTests
• The AstroStat Slog Blog Archive my first AAS. IV. clustering
• The AstroStat Slog Blog Archive [ArXiv] Bimodal Color Distribution in GCS,

... Future seminars . P a s t seminars . Seminar council . Stability of cold fronts in clusters of galaxies " . E. Churazov (IKI, MPA) . ... One of the insteresting results of Chandra and XMM-Newton observatories is the discovery of sharp structures in the X-ray surface brightness of galaxy clusters. These structures (a.k.a. cold fronts) are likely associated with the contacted discontinuities formed when a hot gas flows over a colder gravitationally bound gas cloud. ...

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• (S-7a) The Black Hole at the Center of our Galaxy

... 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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... Globular Clusters, and the Like . ... HST Observations of Stellar Populations in Galaxies . ... Hot Luminous Stars in Nearby Galaxies . ... HST Observations of Faint Stars in Globular Clusters . ... HST Observations of Globular Clusters in M31---Preliminary Results . ... Proper Motions with HST: Searching for High-Velocity Stars in the Core of the Globular Cluster 47 Tucanae . ... The M87 Globular Cluster System Revisited . ... Combined IRAC2 vs HST Color-Magnitude Diagrams of Bulge Globular...

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• The M87 Globular Cluster System Revisited
• Extragalactic Cepheid Distances by Calibrated Period - Luminosity-Color
• Spitzer Sage Observations of Large Magellanic Cloud Planetary Nebulae

... Dept. for Physics of Stars&Galaxies . ... Using a database view Sloan Digital Sky Survey (SDSS), containing almost a million spectra created 15,000 sample galaxies with active star formation, which is used for various studies and physical state of evolution of galaxies. ... Star clusters of the Galaxy . The project MWSC (Milky Way Star Clusters) directory using 2MASS, which includes nearly 500 million vision to the limit Ks = 15.3, analyzed more than 4,000 cluster-like objects in the galaxy. ...

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• Dept. for Physics of Stars&Galaxies
• MAO NASU :: Topic: 1st Announcement IAU Symposium 312 Star Clusters and Black
• Pre-registration form

home publications > mercury . ... Big Clusters, Tiny Galaxies . ... Astronomers struggle to understand why giant star clusters form in the tiniest of galaxies . ... These clusters are probably young versions of globular clusters, but they are commonly called super star clusters. Seven dwarf galaxies within 16 million light-years have formed super star clusters, with one of these galaxies, NGC 1569, possessing two young clusters. ... Super star clusters have a lot to tell us about star formation. ...

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• ASP: Monster Comet Promises Big Show
• ASP: More About Deep Space Objects and Cosmic Terms
• ASP: Black Holes to Blackboards: Drifting Through Andromeda

... With the stars gamma Can and delta Can , it forms another asterisms called " the Asses and the Manger ". ... Formed by the stars delta Ori, epsilon Ori and zeta Ori ; in Latin America it is called the " Three Marys ". ... Built by the four stars alpha UMa, beta UMa, gamma UMa and delta UMa . ... Formed by the four stars alpha Del , beta Del , gamma Del and delta Del . ... Also on Orion; the belt stars ( delta Ori , epsilon Ori and zeta Ori ), the sword and eta Ori build up this asterism. ...

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... no comet has been observed with an orbit that indicates that it came from interstellar space, . ... From this he proposed that comets reside in a vast cloud at the outer reaches of the solar system. ... Unfortunately, since the individual comets are so small and at such large distances, we have no direct evidence about the Oort Cloud. ... T he Kuiper Belt is a disk-shaped region past the orbit of Neptune roughly 30 to 100 AU from the Sun containing many small icy bodies. ... Small Bodies .. ...

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• Comet Introduction
• The Origin of the Solar System
• Jupiter

... In the past used to check pn/ MOS cross calibration Example of old vs new pn/ mos Residuals in the form of ratio data / model for PN data on MOS best fitting model Example of old vs new pn/ mos Residuals in the form of ratio data / model for PN data on MOS best fitting model ACIS S3 vs EPIC pn · · Same thing, only now we compare Chandra ACIS S3 with ... Flux cross-cal · · The new HRMA calibration impacts on the ACIS/EPIC flux cross calibration. ...

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• scisimf