... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Understanding brightness . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Change to COS FUV Pulse Height Filtering to Lower the Observed Dark Rate . ... Changing Programs & Resolving Problems . ... FUV HV History . ... 99% of source counts while removing approximately 20% of the observed dark counts. The actual amount of the dark rate reduction depends on the PHD of the dark counts in each observation, which varies between observations and with solar cycle activity. Because of the incredibly low dark rate on COS, the effect on most observations is very small. ...

... Southern Ocean Sky . ... Alpha Centauri: The Closest Star System . ... The closest star system to the Sun is the Alpha Centauri system. Of the three stars in the system, the dimmest -- called Proxima Centauri -- is actually the nearest star. The bright stars Alpha Centauri.. ... Wilson Observatory's 100 inch telescope, Edwin Hubble determined the distance to the Andromeda Nebula, decisively demonstrating the existence of other galaxies far beyond the Milky Way. Star Factory Messier 17 . ...

... This paper ( Burke et al. 2003 ) describes the creation of one such catalogue - the Southern Serendipitous High-redshift Archival ROSAT Cluster (SHARC) survey - which covers an area of 17.7 deg 2 and consists of 32 clusters with redshifts between 0.05 and 0.7 and X-ray luminosities between 7 x 10 42 and 4 x 10 44 erg/s: the high-redshift subsample contains 16 clusters with = 0.3 and X-ray luminosities greater than 2 x 10 43 erg/s (luminosities are quoted for the 0.5 - 2.0 keV energy band). ... 1997 ...

This is a copy of a Press Release from E.S.O. The most recent ESO observations of bright Comet Hyakutake have shown rapid changes in the innermost coma, within a few hundred kilometres from the cometary nucleus. This result has only become possible because of the unusual combination of a bright comet being near the Earth, together with the excellent imaging quality of the ESO 3.5-metre New Technology Telescope (NTT). ... Go to the ESO Homepage for Comet Hyakutake . ESO/La Silla | ...

... April 13, 1998 . The Sun Changes . ... Explanation: Our Sun changes every day. This recent picture was taken in a very specific red color called Hydrogen-Alpha . Dark spots that might appear on the image are usually sunspots , dark magnetic depressions that are slightly cooler than the rest of the Sun's surface. Bright spots that might appear are usually plages , active regions that are slightly hotter than the rest of the Sun's surface. ... About APOD > . ...

... Ten years ago a startling discovery stunned the astronomical community. ... This illustration reveals the changing rate of cosmic expansion: the shallower the curve, the faster the rate. ... Michael Turner of the University of Chicago coined the term "dark energy" to describe the unknown force that is hastening cosmic expansion. ... If you enjoyed this excerpt from a feature article and would like to receive our quarterly Mercury magazine, we invite you to join the ASP and receive 4 issues a year. ...

... 2.3 Establishing the Extragalactic Distance Scale . ... 2.3.2 The Second Rung: Distances to stellar clusters . ... 2.3.4 Distances to Local Group Galaxies . ... The Luminosity Function of Planetary Nebulae . ... 3.2.2 Clusters of Galaxies . ... 4.2 Evidence for Dark Matter as a Function of Scale Size . ... 4.3 Other Dark Matter Indicators for Galaxies . ... What is the nature of the large-scale distribution of matter in the universe as traced by the three-dimensional galaxy distribution? ...

... ISC Kosmotras . Top Management Founder of ISC Kosmotras - Dr. Vladimir A. Andreev News . ... Dnepr launch record 17 August 2011. Cluster Launch of Dnepr LV 22 August 2013 KOMPSAT-5 Launch 21 November 2013. Dnepr Cluster Mission 2013 19 June 2014. ... According to the decision of ISC Kosmotras Board of Directors, Dr. Vladimir A. Andreev, Director General of ISC Kosmotras, has been appointed to a newly established position of ISC Kosmotras President. ... E-mail: info@kosmotras.ru . ...

... Bad Astronomy . ... I think I will break from my usual format of Bad Astronomy/ Good Astronomy by saying that the way we define seasons currently is not strictly bad, but I feel (in my opinion!) that it could be better. The definition of when the seasons begin is at the moment of solstice or equinox; that is, winter (in the north) starts on December 22 nd and summer starts on June 22 nd . ... Now imagine breaking up the Sun's 46 degree up-and-down yearly swing into 1 day intervals. ...

Vincent Starry, starry night Paint your palette blue and gray Look out on a summer's day With eyes that know the darkness in my soul.. ... Now I understand What you tried to say, to me And how you suffered for your sanity And how you tried to set them free: They would not listen; they did not know how -- Perhaps they'll listen now. ...

... You are here: start €Ё difx €Ё clusterdef . ... difx:clusterdef . ... An example cluster definition file : version = 1 # version number is an integer # node , enabled/disabled (2=head node ), number compute threads, space separated list of urls for data # Later lines supersede earlier lines cuppa01, 2, 7, file :/// exports /xraid01/l_1/ corr file :/// exports /xraid01/r_1/ corr # possible master node cuppa02, 1, 7, file :/// exports /xraid02/l_1/ corr file :/// exports /xraid02/r_1/ ...

... Stellar cinders . Born-again stars . ... Heavyweight Stars . ... What will happen inside the Sun and why? ... These are questions about "stellar evolution", the history of stars as they are transformed by nuclear processes deep inside. ... Most of what we know about stellar evolution comes from computer models of stars. ... We learn about the evolution of high-mass stars from HR diagrams of young galactic open clusters, and the evolution of low-mass metal-poor stars from old globular clusters. ...

Tsys for polA,polB changing in 2003,2004 . 10jan05: Looking at Tsys and maps during various steps of the processing. Looking at the processed data map, beam map, and uv data . ... It would probably be a good idea to fit tsys to the individual days rather than the entire map at once. 2004 map CA04 (.ps) ( .pdf ) . ... The top plot is the average with no raramp remove, the bottom plot is the average with the raramp removed from the pre-basketweave ramap. 2004 map CA04 (after gridding) . ...

... 01.10.2008 (VNY) Added some run-time messages . 09.11.2007 (VNY) Restoring the omgsource flag when extracting the target spectrum: in the case when omgrism is called from the interactive tool omgsource the target spectrum shouldn't be extracted (fixing the SSC-SPR-3702) . ... 15.04.2007 (VNY) More improvements in the field spectra extraction . ... 15.07.2004 (VNY) The target spectrum is placed in the first position in the output file with spectra (SSC-SPR-3356) . ...

Umbriel . Uranus II . Umbriel [UM-bree-ul] is the darkest satellite of Uranus. It is about the same size as Ariel and has about the same density. The surface appears to be old with large craters and does not change much from one location to another. Near the top is a puzzling bright ring called the fluorescent cheerio . ... Dark regions are represented as red and bright regions are represented as blue. The two white regions are bright ejecta from two fresh craters. ...

Umbriel . Uranus II . ... It is about the same size as Ariel and has about the same density. The surface appears to be old with large craters and does not change much from one location to another. ... Orbital period (days) . ... Visual geometric albedo . ... This image is a polar stereographic projection of the southern hemisphere of Umbriel. ... Dark regions are represented as red and bright regions are represented as blue. The two white regions are bright ejecta from two fresh craters. ...

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. ...

... The HH flow associated with young stellar object HL Tau has an exciting history and even until now the origin of some its features is not clear yet. ... Knotty structures of Herbig-Haro jets are common phenomena and knowing the origin of such structures is essential for understanding the processes of jet formation. ... In the flow detected compact knots with high (-150 km/s) and bow shape structures in front of those, with low radial velocities (-50 km/s). ...

... Astronomical Observatory, Shevchenko Park, Odessa, 65014, . ... The XVI -th G. Gamow's Odessa Astronomical Summer Соnference-School, 14-20 August, 2016, Odessa, Ukraine . ... The XV -th G. Gamow's Odessa Astronomical Summer Соnference-School, 16-23 August, 2015, Odessa, Ukraine . ... The XIV -th G. Gamow's Odessa Astronomical Summer Соnference-School, 17-23 August, 2014, Odessa, Ukraine . ... The XIII -th G. Gamow's Odessa Astronomical Summer Соnference-School, 19-25 August, 2013, Odessa, Ukraine . ...