... 2011 November 29 . Across the Center of Centaurus A . Image Credit: NASA , ESA , and the Hubble Heritage ( STScI / AURA ) - ESA /Hubble Collaboration; Acknowledgement: R. O'Connell ( U. Virginia ) . ... Infrared images from the Hubble have also shown that hidden at the center of this activity are what seem to be disks of matter spiraling into a black hole with a billion times the mass of the Sun . ... APOD Graduate Assistantship: Research the universe - support a leading astronomy web site . ...

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• APOD: 2007 April 18 - Barred Spiral Galaxy NGC 1672
• APOD: September 11, 1996 - In the Center of Spiral M77
• APOD: 2012 February 20 - Barred Spiral Galaxy NGC 1073

... Across the Center of Centaurus A . ... Credit Copyright: NASA , ESA , and the Hubble Heritage ( STScI / AURA ) - ESA /Hubble Collaboration; Acknowledgement: R. O'Connell ( U. Virginia ) Explanation: A fantastic jumble of young blue star clusters, gigantic glowing gas clouds, and imposing dark dust lanes surrounds the central region of the active galaxy Centaurus A. This image from the Hubble Space Telescope has been processed to present a natural color picture of this cosmic maelstrom. ...

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• XWare > APOD

... 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. ...

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... STScI-PRC00-37 HUBBLE CAPTURES AN EXTRAORDINARY AND POWERFUL ACTIVE GALAXY Resembling a swirling witch's cauldron of glowing vapors, the black hole-powered core of a nearby active galaxy appears in this colorful NASA Hubble Space Telescope image. ... The larger outer ring extends off the image and is in the plane of the galaxy's disk. ... The black hole and its accretion disk are expelling gas out of the galaxy's disk and into its halo (the region above and below the disk). ...

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• Hubble Provides Multiple Views of How to Feed a Black Hole (PRC98-14)
• APOD: October 18, 1999 - NGC 3603: An Active Star Cluster
• The Sun: a Pictorial Introduction

EMBARGOED UNTIL: 9:20 AM CST, January 6, 1999 CONTACT: John Biretta Space Telecsope Science Institute, Baltimore, MD (Phone: (410) 338-4917; Internet: biretta@stsci.edu) HUBBLE DETECTS FASTER-THAN-LIGHT MOTION IN GALAXY M87 Astronomers reported today discovering clouds which appear to move many times faster than the speed of light, shooting out from the region of a black hole at the center of the M87 galaxy. ... It's an illusion created by the finite speed of light and rapid motion," Biretta said. ...

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• http://www.stsci.edu/~marel/abstracts/psdir/STScI_anrep00_vdM.ps
• Active galaxies and black holes
• Scientific American: Ask the Experts About Astronomy

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. " 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."

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• Solar Flares Reach Earth National Astronomy and Ionosphere Center (Arecibo
• Jonathan T. Fentzke National Astronomy and Ionosphere Center (Arecibo
• Sixto Gonz†бlez National Astronomy and Ionosphere Center (Arecibo Observatory)

http://hubblesite.org/newscenter/archive/releases/1996/22/text/ Probing the mysterious heart of the Crab Nebula, the tattered remains of a stellar cataclysm witnessed more than 900 years ago, astronomers using NASA's Hubble Space Telescope have found that the Crab is even more dynamic than previously understood, based on a cosmic "movie" assembled from a series of Hubble observations. ... Because of this flickering, the neutron star is also called a "pulsar." ...

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Galaxies are diffuse objects which are imaged against a background of finite brightness and noise. Galaxies which have the maximum contrast with respect to this background are the ones that are first discovered. ... These galaxies have been missed to date but active surveys for them are underway. ... In this page we present several examples of these newly discovered Low Surface Brightness galaxies as well as examples of high surface brightness galaxies. ...

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• THE HUBBLE LAW JAVA APPLET

... Tonight's Sky . ... Sky this Month . ... Astronomy for Kids . ... Hubble sees NGC 7090 т?? an active star-forming galaxy . ... This image portrays a beautiful view of the galaxy NGC 7090, as seen by the NASA/ESA Hubble Space Telescope. ... This image portrays a beautiful view of galaxy NGC 7090, as seen by the NASA/ESA Hubble Space Telescope. ... These structures trace the location of ongoing star formation, visual confirmation of recent studies that classify NGC 7090 as an active star-forming...

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• Continent-sized radio telescope takes close-ups of Fermi active galaxies |
• Amateur and professional astronomers team up to reveal a spiral galaxy with a
• Hubble images a spiral galaxy | Astronomy.com

... 739C As one part of a program to detect complete samples of active extragalactic objects, the 3.36x10^-3 sr field centered on alpha=12h04min, delta=+11deg30' (1950.0) was mapped with the Very Large Array at 1411MHz. Sixty-seven maps cover this field so that no point is more than 15arcmin from the nearest map center. ... The rms map noise is 0.030 + 0.001 mJy, and the resulting source list is complete to a map peak flux density S_p = 0.2 mJy within 25 arcmin of the field center. ...

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• Quasars and Active Galactic Nuclei
• Quasar CG 273
• Group IAG

... Today this year's largest group of sunspots will cross the Sun's central meridian. ... The next day, the number of spots in the group reached five, and the day after, on June 2nd, it was possible to count thirteen sunspots on solar disk, which had been clear prior to this. ... This year's two most powerful active areas, which passed across the solar disk at the beginning of May, 2009, are set to appear in the Sun's eastern sector in two days, on June 6th. ...

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• The Sun: from active to quiet. Heliophysics between two solar cycles.
• NASA's Spitzer Images Out-of-This-World Galaxy - Astronomy news
• Sunspots and active regions January 01, 2011

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

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• Charles Dana Discovery Center, Central Park ? Amateur Astronomers Association
• Lincoln Center ? Amateur Astronomers Association of New York
• lincoln center ? Amateur Astronomers Association of New York

... For us to see them from such great distances, quasars must be producing enormous energy -- they are about 1000 times brighter than an average galaxy! ... One of their choices for the energy source of quasars was a black hole. ... On the one hand, it may seem difficult to think that mere friction between bits of matter could account for the energy of a quasar, but, on the other hand, gravity is unimaginably strong near a black hole. ... How does matter actually rush towards the black hole? ...

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• ASP: Book Review
• ASP: Mercury Magazine
• ASP: Star Science in the Autumn Sky

An image of the grand design of spiral galaxy M100 obtained with NASA's Hubble Space Telescope resolves individual stars within the majestic spiral arms. ... Hubble has the ability to resolve individual stars in other galaxies and measure accurately the light from very faint stars. This makes space telescope invaluable for identifying a rare class of pulsating stars, called Cepheid Variable stars embedded within M100's spiral arms. ... 617) 495-7062 . Fax: (617) 495-7356 . ...

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• PAUL J. GREEN - Page de la Maison
• Martin Elvis - Home Page
• Wendy Roberts - Bibliography, Harvard-Smithsonian Center for Astrophysics

The electron density as measured in the transition region of a coronal hole, a 'quiet' Sun region at disk center plus an active region shows variations of up to a factor of two at T_{e} ~ 1.5^{5}K, lasting at most only a few minutes. There is remarkable agreement between the number of such variations, their temporal variability and duration in the coronal hole and 'quiet' Sun datasets, consistent with an earlier bright point study. ...

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• Armagh Observatory
• Terry Mosely's Bulletins
• Solar Active Region 10999 by Deirdre Kelleghan | International Year of

... Active Disk Building in a Local HI-massive LIRG . by Michelle Cluver (UCT) . ... However, the mid-infrared uncovers a star-forming disk housing an intense starburst with a star formation rate of approximately 21 Msun/yr (Cluver et al. 2008 , 2010 ).This luminous infrared galaxy (LIRG) appears to be undergoing asymmetric inside-out disk building, with a star formation efficiency comparable to local disk galaxies and quite different to merger-driven starbursts. ... today * ATNF | ...

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• Active Optics
• The Active Algol Binary KZ Pavonis
• Orientation and Evolutionary Effects in Active Galactic Nuclei

... Our Sun is part of a huge wheel-shaped collection of stars. ... Astronomers have long suspected it was a very massive black hole, and that every galaxy had such a central mass, created early in the history of the universe. ... However, unless that object happens to be headed directly at the black hole (a relatively small target) it will just swing around and fly away again, like a comet making a pass at the Sun. The velocity acquired in falling towards the black hole also helps it escape. ...

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• (S-6) Seeing the Sun in a New Light
• A Brief History of Magnetospheric Physics Before the Spaceflight Era

... Pre-university education . ... Samara region . SSAU History . SSAU roadmap . ... Samara State Aerospace University (SSAU) will take an active part in the work of space activities of the United Nations organization (UNO). ... The road map shape on inclusion of Samara University into implementation of the UN Program on Space Applications was outlined at the roundtable discussion with the University teachers and specialists and at the meeting with SSAU Rector Yevgeniy Shakhmatov. ...

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