... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2012 November 18 . NGC 6357: Cathedral to Massive Stars . Image Credit: NASA , ESA and Jes s Ma z Apell niz ( IAA , Spain) . Explanation: How massive can a normal star be? ... Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357 . ... About APOD | ... A service of: ASD at NASA / GSFC . ...

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• APOD: 2002 November 29 - Open Star Clusters M35 and NGC 2158
• APOD: 2005 November 18 - The 37 Cluster
• APOD: 2001 November 3 - Bright Stars, Dim Galaxy

Astronomy Picture of the Day . ... NASA Explanation: Bright clusters of stars form and disperse near the center of our Galaxy . ... The Quintuplet Cluster is located within 100 light-years of the Galactic center , and is home to the brightest star yet cataloged in our Galaxy: the Pistol Star . ... Publications with keywords: star cluster - Galactic Center - open cluster - star . Publications with words: star cluster - Galactic Center - open cluster - star . ... M45: The Pleiades Star Cluster . ...

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• XWare > APOD

... Star Atlas . ... solar system . ... stars . ... Observe the Solar System . ... What factors determine if a massive star (say, 100 solar masses) forms instead of a Sun-like star? ... Stars of all masses form from dense clumps within exceptionally cold molecular clouds. ... Massive stars tend to form at the centers of high-mass reservoirs of gas. Get instant access to subscriber content on Astronomy.com! ... A gamma-ray burst hints that LIGO's double black holes started as one massive star . ...

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• Do globular clusters form in a galaxy's halo or migrate in from outside? If the
• If a supernovaт??s original star is massive enough to form a black hole, why is
• Airborne observatory views star-forming region W40 | Astronomy.com

... ESO, the European Southern Observatory . ... Member States . ... United Kingdom . Travel and Contacts . Travel to ESO Headquarters . ... Survey Telescopes . ... Galaxy Clusters . ... Star Clusters . ... VLT Unit Telescopes Names . ... Properties of young massive clusters in our Galaxy and in the Large Magellanic Clouds, as well as of Super Star Clusters in star-forming galaxies. The diagram shows the mass and radius of these clusters and also the position of Westerlund 1 (indicated Wd 1). ...

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• Massive Cluster of Galaxies RXCJ1206.2-0848 | ESO United States
• A Massive Star Forming in M17 | ESO United States
• El Gordo: a massive distant merging galaxy cluster | ESO United States

... A Snapshot Survey of The Most Massive Clusters of Galaxies . Abstract . ... Binaries in the Kuiper Belt: Probes of Solar System Formation and Evolution . ... SL2S: The Strong Lensing Legacy Survey . ... Increasing the Accuracy of HST Astrometry with FGS1r . ... GO 11113: Binaries in the Kuiper Belt: Probes of Solar System Formation and Evolution . A composite of HST images of the Kuiper Belt binary, WW31 . ... GO 11289: SL2S - The Strong Lensing Legacy Survey . ... Past weeks: . ...

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• HST this week: 308
• HST this week: 319
• HST this week: 329

... However, while low mass stars are usually found to form in loose groups with densities of a few stars per cubic parsecs, high mass stars are known to form in dense clusters with up to 10000 stars per cubic parsec. ... We have undertaken a survey of a cospicuous number of fields around intermediate mass young stars (Herbig Ae/Be stars, HAeBe) with the aim of detect and characterize the groups of young stars that may have formed together with the HAeBe star. ... BD +404124 - A rich, compact cluster. ...

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• APOD: October 18, 1999 - NGC 3603: An Active Star Cluster
• APOD: December 18, 1999 - Irregular Galaxy Sextans A
• APOD: 2000 June 13 - The Keyhole Nebula in Infrared

... GSAOI Home . ... Science . ... Deep imaging at J , H , and K is required to identify all stellar objects, brown dwarfs, and planetary mass objects in the central region of the Orion Nebula Cluster down to masses comparable to that of Jupiter. This is required to establish the initial mass function, i.e., the number of stars of each mass that have formed, in this region of intense massive star formation. ... The fields of the GSAOI detectors are shown as four green squares in each frame. ...

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• GSAOI Super Star Clusters Science Page
• GSAOI Science Page
• GSAOI Globular Cluster Science Page

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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• Constrains on Dark Matter
• Astronomy HyperText Book: Interstellar Medium
• Low Surface Brightness Galaxy Gallery

... 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
• Pulsar Highlights - Dense Matter

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

... Following several successful moon landings,NASA decided to use its last Saturn V not to fly to the moon but to place in low Earth orbit a large space station, named Skylab. ... It was followed that year by three manned flights using the smaller Saturn IB, each carrying 3 astronauts for a prolonged stay aboard Skylab. ... Mass measurements aboard Skylab were part of the medical experiments conducted there. ... Measuring body mass in the M172 chair (see illustration) was not a simple matter. ...

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• Solar Energetic Particles
• Comet Introduction
• Jupiter Moon Callisto

... ATCA remote observing . by Jacinta Delhaize ( University of Zagreb ) . Merry Christmas from the Galaxy Evolution group at the University of Zagreb! ... We spent the nice, RFI-free time collecting 2.1 GHz radio continuum observations of the XXL-South galaxy cluster field to do redshift evolution studies of active and star forming galaxies. ... In the above picture: Jacinta Delhaize and Nikola Baran ). | ... today * ATNF | ... ATCA | ...

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• ATNF Colloquium

In 1995 Ukraine started operation of Vernadsky antarctic research station . The station was transfered by Great Britain, former Faraday station. ... Vernadsky is the British Antarctic Survey (BAS) former Faraday station that has been transferred free to Ukraine for Ukrainian Antarctic Center (UAC) at 7 February 1996. ... Vernadsky (Faraday) is the oldest operational station in the Antarctic Peninsula area. ... Vernadsky is the first Ukrainian Antarctic station. ...

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• Extragalactic Astronomy

... Korea Astronaut Program (KAP) . ... four sets of demonstration equipment representing sets of objects for demonstrating basic physical laws. The Space Pen equipment set includes two fans and three pens: normal gel pen, special space pen and brush pen. Space pen set; . Space pen, gel pen and brush pen of a polymer material; . ... Newton’s law set includes various equipment (rope, two spheres, spherical shells, force and mass set) designed for demonstration of Newton’s laws in microgravity). ...

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This Directory contains mean hourly, mean daily and mean monthly values of cosmic ray intensity recorded by World Network NM stations to the end of 2011. ... CD is created in WDC for STP, Moscow and IZMIRAN. ... This directiry contains catalogue Corrected for pressure and verificated data in WDC for STP, Moscow . This directiry contains catalogue Corrected only for pressure but Original data in WDC for STP, Moscow . ... 20 May - 22 July 1972, M., 1975 6. 27 March - 22 July 1972, M., 1975 7. ...

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My wife and I went to Mohican State Park the weekend just before our first anniversary (April 7th). That Saturday, we went hiking and took some pictures. It was a good hike, with some difficult parts. my wife holding the camera . a crevice with a tiny waterfall, that opens up into a big valley . the tiny creek flowing into the crevice . more crevice . ... my wife taking a (non-digital) picture . another tiny waterfall flowing over a wide cliff . ... the lake by our lodge . ...

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• dictionary
• Southern SHARC survey
• The AstroStat Slog Blog Archive A confession from a former ?keV? junkie (2.

... Magnetic Storms . ... Cosmic Rays . ... Energetic Particles . ... Solar fast Particles . We cannot observe the way the distant universe accelerates cosmic rays or produces energetic photons, but acceleration processes also occur on our Sun , though on a much more moderate scale. ... That is why such events are often missed by cosmic ray detectors near the equator, where the lowest energies are excluded by the Earth's magnetic field. ... Should we be concerned about solar energetic radiation? ...

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• Mass Measurements aboard Space Station Skylab
• Substorm Event On November 24, 1996
• Space Weather

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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• NGC 6302: A vast cosmic butterfly | Astronotes
• Omega Centauri: globular cluster of 300,000 stars | Astronotes
• Orbital Mechanics | Astronotes

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: Cosmic Collisions
• ASP: A Good Definition of the Word "Planet": Mission Impossible?
• ASP: More About Deep Space Objects and Cosmic Terms

... Primordial theory review : Dick Bond . Defects and the CMB review : Andy Albrecht . ... Gravitational wave contribution to CMB anisotropies : V.B. Lukash and E.V. Mikheeva . C_l from cosmic strings : Lloyd Knox . Some aspects of CMB anisotropies induced from topological defects : Mairi Sakellariadou . ... CMB anisotropies from scaling sources : Ruth Durrer . ... SZ observations I : Sarah Church . ... Holes in the microwave sky? ... Detecting cosmic strings in the CMB : James Robinson . ...

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• Galaxy Evolution Over Five Decades
• Astrophysics Group Cosmic Microwave Background (CMB)
• Astrophysics Group AMI Science