... 2006 December 19 . Massive Stars in Open Cluster Pismis 24 . Credit: NASA , ESA and J. M. ApellАniz ( IAA , Spain). Explanation: How massive can a normal star be? Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it a record holder. ... Component stars would still remain near 100 solar masses, making them among the more massive stars currently on record. ... About APOD | ...

... Massive Stars in Open Cluster Pismis 24 . ... Estimates made from distance, brightness and standard solar models had given one star in the open cluster Pismis 24 over 200 times the mass of our Sun, making it a record holder. ... Toward the bottom of the image, stars are still forming in the associated emission nebula NGC 6357 , including several that appear to be breaking out and illuminating a spectacular cocoon . ... Publications with keywords: massive stars - star formation . ...

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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. ...

HUBBLE SPACE TELESCOPE DAILY REPORT #1144 PERIOD COVERED: 0700 EST Daily Status Report as of 143/1200Z. 1.0 ACTIVITIES SCHEDULED AND ACCOMPLISHED: 1.1 Completed WF/PC-2 5560 (WF/PC-2 Cycle 4 Calibration: Internal Monitor. 1) The WF/PC-2 was used to make several internal bias, K-Spot, and flat calibration observations to monitor the CCD camera electronics, the optical alignment, and for contamination. ... Four observations were executed as scheduled, and they were reported to look okay. ...

... BLUE STRAGGLER STARS are unusually hot and bright stars found in the cores of ancient star clusters known as globulars. ... BACKGROUND (from wikipedia): Blue straggler stars are stars in open or globular clusters that are hotter and bluer than other cluster stars having the same luminosity. ... There is evidence in favor of this view, notably that blue straggler stars appear to be much more common in dense regions of clusters, especially in the cores of globular clusters. ...

... About ATMoB . ... The Observing Committee is starting an Observing Awards Program to promote observing among the membership of the Amateur Telescope Makers of Boston. ... Participant must be a current member of the Amateur Telescope Makers of Boston . ... To qualify for your Observing Award Certificate, turn in your worksheet and drawings to an ATMoB Observing Committee member or observing@atmob.org . ... This Excel sheet has useful macros. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... We now know that globular clusters formed at high redshift and that they survived violent merging events and galaxy metamorphoses with time, preserving the chemo-dynamical record of their parent galaxies. ...

... 2000, ApJ, 537, L49 . ... F. Palla . Invited Talk at the IAU Symposium 200 "The formation of binary stars" eds. R.D. Mathieu and H. Zinnecker (ASP Conf. Ser.) in press . Optical follow-up of ROSAT discovered candidate members of the open cluster Coma Berenices . ... 2000, A , in press . ... 2000, ApJ, in press . ... 2000, ApJ, in press (Sept. ... 2000, ApJ Lett., in press . ... Click to examine publications from other years . ... Star Formation Group . ... Arcetri Home Page . ...

Next: Format files Up: Star tables Previous: Star tables . ... If so, simply copy out the data for your program stars as fixed-format ASCII records, one star per record. ... It will first ask for the name you want to give your new program-star table. ... It is important to make sure the star names in your source files match those in your data files. ... That means using short, unique names in your program-star files, to match those that will appear in the data. ...

Turning the Camera Skyward . A reconfigured camera can take wide-field exposures of astronomical objects (constellations, the Milky Way, zodiacal light, moving artificial satellites, meteor showers, variable stars, etc.) to reveal much fainter objects and structures than seen by naked eye. ... This picture reveals objects more than 2.5 times fainter than can be seen by the naked eye, including not only stars but also the Orion nebula (M42), where new stars are being born. ...

... One of this year's largest mass ejections from the Sun's atmosphere was recorded last Sunday by TESIS telescopes aboard the CORONAS-PHOTON satellite ( video - wmv 4.3 MB ). ... Over the course of a week, two gigantic solar prominences were simultaneously ejected from the surface of the Sun. ... Earth will not feel the Sun's influence either. ... The TESIS observatory ї TESIS: www.tesis.lebedev.ru . ... One of this year's largest mass ejections from the Sun's atmosphere (movie WMV, 4.3 MB) . ...

... ISC Kosmotras . ... Comments, Opinions Publications Dnepr Program . Dnepr launch record 17 August 2011. ... The success of PICARD launch re enforces our high level of appreciation of the quality of the DNEPR launcher and of the professionalism and efficiency of ISC Kosmotras. ... The distinguishing feature of the THEOS launch by a converted SS-18 ICBM (Dnepr LV) is that it was the first ISC Kosmotras mission from the Yasny launch site that headed southward to its Sun-synchronous target orbit. ...

... weather conditions . where to look . common halos . ... single crystals . ... ice clouds . windblown crystals . ... ray paths, 60deg and 90deg prisms (how we get 90deg refractions in ice)) . crystal orientations . ... history of simulating halos . ... examples . ... Unususal crystal orientations . Unusual crystal forms . ... I know there is some work on crystal collection from aircraft and attempts to make model (non-ice) crystals. ... Graphic of crystal types: example . ...

... Over the first 4 years, its X-ray telescopes eROSITA and ART-XC will survey the whole sky with a record sensitivity in the 0.5-10 keV energy band. ... The goal of the second international Spectrum-RG conference is to discuss the different scientific topics addressed by the mission, synergies with surveys at other wavelengths, and requirements to follow-up observations.Contributed talks and poster presentations are invited on the topics related to the SRG science goals. ... Active galactic nuclei . ...

... Armagh Observatory reports that December was much colder, sunnier and drier than average. The mean monthly temperature was тАУ0.3 degrees Celsius (31.4 degrees Fahrenheit), about 5.4 Celsius below average, making December 2010 the second coldest December in Armagh since records began around 1795. The three coldest Decembers in Armagh are now those of 1878, 2010 and 1796 , with average temperatures of -0.5 C, -0.3 C and 0.6 C respectively. ...

... 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. ...

... Mass . ... 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...

Title: A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant . Authors: Norman A. Grogin , Ramesh Narayan (Harvard Univ.) ... Title: ROSAT/PSPC observation of the distant cluster CL0939+472 . ... Title: Interaction in the Bimodal Galaxy Cluster A3528 . ... Title: Cosmological Implications of Galaxy Cluster Evolution . ... Title: Galaxy Cluster Virial Masses and Omega . ... Matches 201 to 222 from a total of 222 matches for the search pattern galaxy cluster . ...

... With a face like this I won't break any hearts And thinking like that I won't make any friends Screw that, forget about that I don't wanna hear about anything like that Screw that, forget about that I don't wanna know about anything like that I've got nothing to do 'cept hang around and get screwed up on you. ...