... December Sunrise, Cape Sounion . ... The Sun is a moving target. ... How do planets form? ... If you went outside at exactly the same time every day and took a picture that included the Sun, how would the Sun appear to move? ... Aurora Shimmer, Meteor Flash . ... Dust particles strung out along the orbit of extinct comet Phaethon vaporize when they plow through planet Earth's atmosphere causing the impressive display. ... In 1996, an unexpectedly bright comet passed by planet Earth. ... December . ...

... 2013_December s131215_200408 not include in standard . ... 2011_June s110622_141256 not include in standard . ... OtherProjects t100405_182443 not include in standard . ... 2010_January t100110_181805 not include in standard . ... OtherProjects s081218_213556 not include in standard and timing . ... 2008_July s080724_073327 not include in standard and timing . ... 2007_September a070910_055634 not include in standard . ... OtherProjects a070819_052215 not include in standard and timing . ...

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 . ...

... 2010 August 16 . Meteors Over Quebec . ... Explanation: Meteors streaked through the sky above many of Earth's cities last week, but nobody was hurt, and no damage has been reported. ... The large triangle in the foreground, although impressive in appearance, was not part of the Earth's meteor defense system. The space attack was expected as part of the annual Perseids meteor shower as the Earth passed through sand-sized debris left over from the sun-orbiting Comet Swift-Tuttle . ...

. Image created by Miruna Popescu, showing some of the objects displayed in the Armagh Observatory's Human Orrery. Original images from NASA were used.

... Robert L. Stewart (Brigadier General, USA, Ret.) ... SPECIAL HONORS: Awarded Army Distinguished Service Medal , Defense Superior Service Medal , 2 Legion of Merit, 4 Distinguished Flying Crossed, a Bronze Star, a Meritorious Service Medal , 33 Air Medals, the Army Commendation Medal with Oak Leaf Cluster and V Device, 2 Purple Hearts, the National Defense Service Medal , the Armed Forces Expeditionary Recipient of NASA Space Flight Medal (1984 & 1985). ...

... 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) ...

... 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. ...

... ATM Discussion Forum . Forums: . ... How to clean the rust on the quartz glass lens - flyingmelon - September 18, 2010 - 08:55 UTC . ... Depends - rick_crockett - May 26, 2008 - 03:52 UTC . ... Canon DSLR CONTROLLER USB SERIAL PORT - costas - October 31, 2007 - 16:02 UTC . ... Star Lap - berry - December 30, 2006 - 21:46 UTC . ... www.astronomy.net . ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

Next: A Region mask for Up: To produce a region Previous: Select a circle around . select cursor and box . The three mouse buttons have been redefined as: . LEFT - moves the center of the box to the position of the arrow point. MIDDLE - sizes the box. ... Release the button to fix the size of the box. save the results by typing `s' while the mouse is in the display window. select region and write , to write the saved regions into a file for later use (as above). rsdc@cfa.harvard.edu . ...

... These Frontier Fields will combine the power of HST with the natural gravitational telescopes of high-magnification clusters of galaxies. ... We are soliciting gravitational lensing maps for the last four Hubble Frontier Fields clusters (MACSJ0717.5+3745, MACSJ1149.5+2223, AbellS1063, and Abell 370) based upon the exceptionally deep HST FF imaging and other new ancillary data. ... For the full set of proposal instructions and requirements, see the FY16 Frontier Fields Lensing Map Call for Proposals....

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... Fees . ... 2/3-m Telescope . ... Irvin M. Winer . ... Site . ... Telescope Aperture / Mount . ... 20,000 . ... Meade 20-inch MAX on MAX Mount . ... Housing in our automatic observatory at our site near Sonoita, Arizona . ... Telescope (you provide the telescope, mount, control computer, cables, etc.) ... Long distance telephone charges for calls initiated by your computer or staff on Winer telephones . ... 2013 Winer Observatory. ...

... 333/2 including HTML versions of articles . ... 332/3 including HTML versions of articles . ... 331/3 including HTML versions of articles . ... 330/3 including HTML versions of articles . ... December 1997 . ... November 1997 . ... Indexed/abstracted in Astronomy and Astrophysics Abstracts, CAS, Current Contents, INIS, Inspec, Physics Abstracts, Physics Briefs, PHYS on STN, Science Citation Index, Technical Information Center/Energinfo, and Zentralblatt f r Mathematik . ... helpdesk@link.springer.de...

... For a timeline of the exploration of the magnetic environment of the Earth, Sun and Planets, see here . ... Galileo Galilei (1564-1642) builds the first astronomical telescope and observes for the first time craters on the Moon, satellites around Jupiter, and the way Venus goes through phases like the Moon (crescent, etc.) ... 17 December--First successful flight by the Wright brothers at Kitty Hawk, North Carolina. ... 16 March--Goddard launches his first liquid-fuel rocket. ...

... Gift Center . ... Why do aurorae appear strongest within rings centered on Earth's poles instead of filled-in circles? ... RELATED TOPICS: AURORAE . The visible aurorae result from electrons that move along magnetic field lines from space into the upper atmosphere. ... Just make sure you're registered with the website. Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

... Full version (including all figures and appendices [3.1 MB]) . Reduced version 1 (except german summary and appendices [2.4 MB]) . Reduced version 2 (except german summary, appendices and figures [0.2 MB]) . ... Figures of Chapter 2 (10 figures [1.4 MB]) . ... Chapter 2 ( Photometry of galaxies in selected CCD fields [1.4 MB]) . ... Chapter 6 ( Summary and Future Work [40 kB]) . Chapter 7 ( Zusammenfassung (German summary) [36 kB]) . Appendix A ( The photometric catalog [65 kB]) . ...

ATMoB "Open Cluster Observing Award " Guidelines Purpose: To promote observing among the membership of the Amateur Telescope Makers of Boston through participation in the Open Clusters Observing Awards program. Introduction: This awards program is oriented towards visually observing open clusters above magnitude 9.9. ... It turns out that a very unprejudiced and convenient method to dermine the limiting magnitude is to count the number of visible stars in certain areas on the sky. ...

OptInt PmWiki : Pm Wiki / Wiki Style Examples . Wiki styles | ... PmWiki uses WikiStyles for styling text with color and other attributes. PmWiki 2.0 introduced the ability to control the styling further and to even place styles on blocks. ... In addition, an author can define a style "shortcut" by using the define= property. For example, to define a style of %red% , one can use: . define=mystyle color=red% Here is some %mystyle% red text created using a style shortcut. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. December 18, 1999 . Irregular Galaxy Sextans A . ... Their newly formed, bright, blue star clusters found along beautiful, symmetric spiral arms are guaranteed to attract attention. But small irregular galaxies form stars too , like this lovely, gumdrop-shaped galaxy, Sextans A . ... About APOD > . ...

... Questions relevant to "Exploration of the Earth's Magnetosphere" will be answered, to the extent time allows. If a question seems to be worthy of broader interest, it and its answer (suitably edited) may be added to the list appearing in "Exploration." ... Please do observe the following: . ... Asking about matters which are far beyond the scope of "Exploration." ... Posing a question without first checking if it was answered in the main files of "Exploration" or in the question-and-answer list. ...