... Black Holes and Galactic Centers . ... Do all galaxies have black holes at their centers? ... Sunspots: Magnetic Depressions . ... Our Sun has spots! These spots appear dark in photographs like the one above, but in fact sunspots are quite bright - they are just dark compared to the rest of the Sun. Sunspots are about the size of the Earth and frequently occur in groups, as shown above. Mercury in Stereo: Craters Within Craters . ... Blue Sun Glaring . ... Too Close to a Black Hole . ...

Discover the cosmos! ... February 28, 1996 . Explosions Discovered Near Galactic Center . ... Explanation: Tremendous explosions near the center of our Galaxy were discovered just this past December and are being announced today by a paper in Nature and a press conference at NASA . Bursts like these have never been seen before, and so the exact cause is unknown and will likely be the source of astronomical speculations and observations for years to come. ... About APOD | ...

. " The Arecibo Observatory is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations . expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."

... Home Observing Lincoln Center . ... AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . ... This MonthтАЩs Sky тАУ April 2015 . This MonthтАЩs Sky тАУ May 2015 . This MonthтАЩs Sky тАУ June 2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... Tonight's Sky . ... Observing . ... solar system . ... Solar eclipse travelogue: Sulawesi delivers a spectacular eclipse . ... Observe the Solar System . ... Get to Know the Night Sky . ... Observing springtime deep-sky objects with a large telescope . ... Get ready for the 2017 total solar eclipse! The next total solar eclipse visible from the continental United States occurs August 21, 2017. ... This will be the first total solar eclipse to cross our country in 38 years. ... November 25, 2014 . ...

... НЕПРЕРЫВНОГО МАТЕМАТИЧЕСКОГО ОБРАЗОВАНИЯ . ... Кружок ?Олимпиады и математика? ... Московская математическая олимпиада . Заочный математический конкурс . ... Устные математические олимпиады . Олимпиады по программированию . Математический праздник . Математические регаты . ... Математические бои . Олимпиада по геометрии им. И.Ф.Шарыгина . ... Программа ?Math in Moscow? Научные конкурсы . Творческий конкурс . ... График олимпиад . ... XXVII Математический праздник . ...

January 8, 2010 (Friday) Eugene Lim, Columbia University . ... February 15, 2010 Mariangela Lisanti, Stanford . ... 4:00pm, 472 Willamette Hall . ... return to top . ... Jets of hadrons are produced both by decays of strongly-interacting new particles beyond the Standard Model and by ordinary Standard Model interactions in high-energy collisions. Discovering new physics at the Tevatron or LHC will require reliable identification of the underlying high-energy particles that produce different jets. ...

On Thursday, 1998 February 26, a total eclipse of the Sun was visible from within a narrow corridor traversing the Western Hemisphere. The totality path (or path of the Moon's umbral shadow) began in the Pacific, continued through northern South America and the Caribbean Sea, and ended at sunset off the Atlantic coast of Africa. ... Some of the best placed sites along the totality path were in Venezuela. ... Exposure time was 1/2 second. At this location totality lasted 3min 36sec. ...

... Институт прикладной математики им. М.В.Келдыша . БАЛЛИСТИЧЕСКИЙ ЦЕНТР . О Центре . ... Баллистический Центр Института прикладной математики им. М.В.Келдыша РАН . Баллистический центр (БЦ) ИПМ им. М.В. Келдыша создан по предложению С.П. Королева и М.В. Келдыша в 1965 году. На него были возложены работы по баллистико-навигационному обеспечению (БНО) управления полетом пилотируемых кораблей и автоматических космических аппаратов научного и народно-хозяйственного назначения. ...

Armagh Observatory, 24 July 2000: . The Minor Planet Center at the Smithsonian Astrophysical Observatory, Cambridge, Massachusetts, USA, has announced the discovery of a new moon of Jupiter, bringing to 17 the number of known satellites orbiting the giant planet. ... At that time, Jupiter was about 370 million miles from Earth, just about as close as it ever gets, and therefore a good time to search for any faint satellites. ... Last Revised: 10th August 2000 . ...

... Observations . ... Natural Satellites Data Center. ... Nomenclature of satellites | ... Inner satellites of Jupiter . ... Inner satellites . Mutual events of the Galileans . ... Inner satellites of Saturn . Main satellites of Saturn . ... Mutual events of the main satellites . Inner satellites of Uranus . Main satellites of Uranus . ... Mutual events of the Uranian satellites . Inner satellites of Neptune . Main satellites of Neptune . Outer satellites of Neptune . ...

Total lunar eclipse of 2008 February 21 The beginning of the eclipse visibly in Europe, south-western Asia, Afri- ca, Madagascar, Northern America (except the extreme northwest), South Ameri- ca, in the Atlantic coast of Antarctica, in the extreme West of Indian Ocean, South-eastern Pacific Ocean, western Arctic Ocean, Atlantic Ocean. ... 16 10.50 15 34.09 Circumstances of the Eclipse Position Angles of the Moon's axis h m o Moon enters penumbra . February 21, 0 34.8 19.08 Moon enters umbra . ...

... SEARCH ASP SITE: Match ALL words Match ANY word . ... Point: Where Is the Best Place to View a Solar Eclipse? ... As viewers venture away from the center line of the eclipse path, the eclipse lasts for a shorter time (smooth line), but edge effects such as Baily's beads persist for longer (spiked line). ... The eclipse is longest on the center line of the path; the rare view of the Sun's beautiful white outer atmosphere, the corona, which can be seen only during eclipses, is also longest there. ...

... The highest redshift X-ray jet discovered . by Chandra in GB 1428+4217 at z = 4.72 . X-ray jet discovered by Chandra . ... Science Papers on ADS . ... Chandra Press Release . The paper describing the details nas been published in ApJ and it is available also on astro-ph Feb. ... The jet paper published in ApJ Letters is available on astro-ph Oct. ... ApJ Letters paper available on astro-ph: Paper 2003 Feb. ... ApJ papers available on astro-ph: Paper 1, 2002 and Paper 2, 2007 . ...

... Faraday's Lines of Force (field lines) . Faraday's Disk Dynamo . ... The Earth's Dynamo . ... Magnetic Storms and Ring Currents . The Magnetosphere . ... Chronology of Geomagnetism . ... 1581 Robert Norman publishes "The Newe Attractive," . ... 1832 Faraday tries to detect a dynamo current in water flowing in the Earth's field. ... magnetic storm. ... 1903 Birkeland proposes the existence of "polar magnetic storms," He also . ... 1919 Joseph Larmor proposes that magnetic fields of sunspots . ...

... Comet Tutorial . ... On July 1, 1993 an image was taken with the Hubble Space Telescope (HST) that clearly shows at least 15 individual fragments in one image frame of the train. ... This made an accurate orbit (or orbits) difficult to determine; however, after numerous observations of the comet, astronmers determined that the comet had passed within 96,000 kilometers (60,000 miles) of the center of Jupiter or 25,000 kilometers (16,000 miles) from the cloud tops during the July 8, 1992, approach. ...

HST has resumed science observations with NICMOS, FGS and WFPC2. ... Abstract . ... Leon Koopmans, Kapteyn Astronomical Institute . ... The largest Kuiper belt objects . ... Comprehensive Auroral Imaging of Jupiter and Saturn during the International Heliophysical Year . ... 2007 has been designated the International Heliophysical Year, and HST will be playing a key part in the associated scientific activities by participating in a detailed investigation of auroral activity in jupiter and Saturn. ...

The period of this variable was first determined by Tony Vanmunster (Center of Backjard Astrophysics). We have taken the observations with CCD ST-7 and 60-cm reflector of SAI Crimean station. ... The longest set was taken at night of 2000 February 12 including 291 R 60 second long frames with the magnitude limit of 18. Summing all these frames in a single one I have taken a "deep sight" of this region having the limit of 21.7R. The effective exposition is 4 h. 51 m. Look at this frame! ...