... Star Streams and the Sunflower Galaxy . ... Also cataloged as NGC 5055, the majestic island universe is nearly 100,000 light-years across, about the size of our own Milky Way. ... At the northwestern edge of the constellation Vela (the Sails) the four frame mosaic is over 10 degrees wide, centered on the glowing filaments of the Vela Supernova Remnant, the expanding debris cloud from the death explosion of a massive star. Cepheus: Trunk to Bubble . ... A Laser Strike at the Galactic Center . ...

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... 2010 September 9 . Cepheus: Trunk to Bubble . ... Explanation: Star clusters, glowing nebulae and dark dust clouds abound in Cepheus , royal constellation of the northern hemisphere. ... Beginning at the lower left, the large emission nebula is cataloged as IC 1396 . ... At the upper right lies NGC 7635 (the Bubble Nebula ) and star cluster M52 . ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . NASA Web Privacy Policy and Important Notices . ...

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• APOD: 2014 January 23 - Double Cluster in Perseus
• APOD: 2009 January 3 - Double Cluster in Perseus
• APOD: 2009 December 4 - The Double Cluster

... 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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... 1st Announcement IAU Symposium 312 Star Clusters and Black Holes Across Cosmic Time, Beijing, China, Aug. 25-29, 2014 . ... SUBJECT: 1st Announcement IAU Symposium 312 Star Clusters and Black Holes Across Cosmic Time, Beijing, China, Aug. 25-29, 2014 . ... which will be held in Beijing, P.R. China, from August 25-29, 2014, hosted by Chinese Academy of Sciences . ... China), . ... 1st Announcement IAU Symposium 312 Star Clusters and Black Holes Across Cosmic Time, Beijing, China, Aug. ...

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... Research . ... High-velocity clouds are not homogeneously distributed across the sky. ... Some of them have been grouped into complexes, including complex L, the complexes in the direction of the Galactic centre (GCP and GCN), or the so-called Wannier clouds (WA WE). ... 1: All-sky map of high-velocity clouds as described below. ... The H i column density map of the HVC sky was finally converted into the Hammer-Aitoff projection which has the advantage of being an equal-area projection. ...

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• The Las Campanas/AAT Rich Cluster Survey
• A Radio Survey of Older T Tauri Stars in the Chamaeleontis Cluster
• Compact Stellar Systems in the Fornax Cluster: Super-massive Star Clusters or

PHOTO CAPTION STScI-PR94-40 FOR RELEASE: October 17, 1994 TALE OF TWO CLUSTERS YIELDS SECRETS OF STAR BIRTH IN THE EARLY UNIVERSE This NASA Hubble Space Telescope (HST) image shows rich detail, previously only seen in neighboring star birth regions, in a pair of star clusters 166,000 light-years away in the Large Magellanic Cloud (LMC), in the southern constellation Doradus. The field of view is 130 light-years across and was taken with the Wide Field Planetary Camera 2. ...

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• APOD: July 9, 1999 - NGC 7789: Galactic Star Cluster
• APOD: 2000 August 4 - M15: Dense Globular Star Cluster
• A new survey of X-ray clusters of galaxies with the Swift-X-ray Telescope

Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

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... We present a comparison of the surface density of young stars (неБ‹†) and dust surface density (неdust) across NGC 346 (N66) in 115 independent pixels of 6 ц— 6 pc2. ... We convert неdust to gas surface density (неgas) and неБ‹† to star formation rate (SFR) surface densities (неSFR), using simple assumptions for the gas-to-dust mass ratio and the duration of star formation. ... On small scales the неSFR derived using Hн± systematically underestimates the count-based неSFR, by up to a factor of 10. ...

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• High Redshift Cluster Projects
• Dust Production and Mass Loss in the Galactic Globular Cluster NGC 362
• HST this week: 203

... Structure of Data . ... Catalog . ... In SAI OCL Catalog, we introduce our work on investigation of the Milky Way system of open star clusters. The main goal of our study is a search for new clusters using huge surveys. 168 new clusters have been already discovered by us using J,H,Ks data from 2MASS point source catalog. ... For 141 new clusters, we found their physical parameters using J,H,Ks data from 2MASS catalog and, for a number of clusters, our UBVRI CCD observational magnitudes. ...

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• SAI OCL Catalog Publications
• SAI OCL Catalog Description
• SAI OCL Catalog Structure

. The space-warping galaxy cluster Abell 1689, which lies 2.2 billion light-years away in the constellation Virgo, contains trillions of suns, but most of its matter can't be seen. Still, this unseen mass affects space, bending the light from individual galaxies behind the cluster into multiple curved, bluish arcs. This image is about 2 million light-years across. NASA/ESA and the ACS Science Team

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B7AAC2165-B2F3-4448-BCE8-F2C6CBA78534%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B1686988D-F2FC-4A24-976D-54D3EA22A310%7D
• A violent, complex scene of colliding galaxy clusters | Astronomy.com

... Cepheids and star groupings Sternberg Institute, Moscow University, 1983 Professor, 1997 Employment: 2000 -present Main sciential fellow, Sternberg Astronomicl Institute (SAI) of Moscow State University 1989 - 2000 Head of the Department for Galactic and Variable Stars Researches, SAI 1986 - 1989: Leading Scientific Fellow, SAI 1973 - 1986: Senior Scientific Fellow, SAI 1960 - 1973: laborant, aspirant ... 22, 161, 1978 3) Star complexes. ... Astron. ... Large scale star formation in galaxies. ...

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• Yuri Nicolaevich Efremov - My Home Page
• Division of the Galaxy and Variable Stars

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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• A Spectacular View of the Lagoon Nebula | Astronotes
• Astronotes | Armagh Planetarium's astronomy news from across the Universe -
• Hubble shows us a spectacular star cluster | Astronotes

... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO Acronyms . ... Survey Telescopes . ... Galaxy Clusters . ... Star Clusters . ... Stars@ESO . ... ESO 3.6-metre telescope . ... This video pan sequence gives a close-up view of one of the brightest star clusters in the sky. This image from the Wide Field Imager on the MPG/ESO 2.2-metre telescope at ESOтАЩs La Silla Observatory in Chile, shows Messier 7, also known as NGC 6475. ... 180.0€аMB . ...

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• Panning across VISTAтАЩs infrared image of the globular star cluster Messier 55
• Panning across the star cluster Messier 67 | ESO
• Panning across the globular star cluster NGC 6362 | ESO

ABSOLUTE PROPER MOTIONS OF 331 OPEN CLUSTERS . ... The proper motions of stars in the fields of 331 open clusters were taken from Four-Million Star Catalog (4M-catalog) of positions and proper motions (Volchkov et al. ... The absolute proper motions for 21 young open clusters have been derived by comparison of precise relative proper motions of individual stars and their corresponding absolute proper motions. ... Sign of proper motions in RA . ... 0.0001 arcsec/yr . ... rms error in RA proper motion . ...

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... 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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• ALFALFA Dark Cloud
• Figures for Scattering Paper
• GOLDMiNe: Virgo cluster optical and HI databases

... Tully+ VII/145 Nearby Galaxies Catalogue (NBG) (Tully 1988) ============================================================================= Nearby Galaxies Catalogue TULLY R.B ============================================================================= ADC_Keywords: Galaxy catalogs ; In CATS there are no files groups, clusters ******************************************** This compendium is a companion to the Nearby Galaxies Atlas (ref. 29; hereafter NBG Atlas). ... There are three parts to the...

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• A 1400-MHz Survey of 1478 Abell Clusters of Galaxies
• A 20 cm VLA survey of Abell clusters of galaxies
• Catalog of Galaxies behind the Milky Way

... 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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... The overall globular cluster population is divided by gap in the metallicity function at [Fe/H]=-1.0 into two discrete groups with well-defined maxima at [Fe/H]=-1.60?0.03 dex, and -0.60?0.04 dex. ... Clusters with extremely blue horizontal branches occupy a spherical volume of radius ~ 9 kpc, have high rotational velocities ( V rot =77?33 km/s), have substantial and equal negative radial and vertical metallicity gradients, and are, on average, the oldest group (the old-halo subsystem). ...

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• Population of Galactic globular clusters, figures

... Astrophysics Group . ... AMI Science . ... Observations of galaxy clusters are central to the AMI science programme. The AMI Small Array is used to observe already-known clusters with high-sensitivity and resolution, allowing us to extract detailed information about individual clusters and to build up statistics about the cluster population. ... Observing galaxy clusters at 15 GHz is tricky because of the contamination from foreground radio sources, which is where the Large Array comes in! ...

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• Supernova Remnant (SNR) Catalogue or Catalog of Galactic SNRs

... GSAOI Home . ... Science . ... The goal of this project is to detect the termination of the white dwarf cooling sequence in nearby open star clusters, and hence derive cluster ages that are independent of the normal main sequence turnoff method. ... The potential for accurate proper motion measurements, i.e., measurements of transverse motion across the sky, with GSAOI offers a means of overcoming this difficulty. ...

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• Dougal Mackey - Research
• GSAOI Globular Cluster Science Page
• GSAOI Super Star Clusters Science Page