... Tonight's Sky . ... The Magazine . ... Observing . ... Magazine . ... Product Reviews . ... View more active galactic nuclei . ... In the July 2013 article, Secrets of the brightest objects in the universe, I describe what astronomers currently know about quasars, which are the most luminous type of active galactic nuclei (AGNs). ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

Summer Earth and Space Science Workshops for Teachers! ... Join us in Baltimore, Mar yland from July 30­ August 3, 2011 for one or more of the following: Weekend 2-Day Workshop , July 30­31 · In the Footsteps of Galileo: A Hands-on Workshop on Astronomy for Teachers Weekday 3-hour Short Courses, August 1­3 · Active Astronomy : Classroom Activities for Learning about the Electromagnetic Spectrum · Chasing Shadows: Bring NASA's Search for Earth-like Planets Around Other Stars ...

... The active time at each angular bin is the sum over frames of the active time contributions from all CCD pixels, within the node-specific telemetry window, which overlap the surface of the bin. ... The active time, per frame, of a normal pixel is the full frame integration time multiplied by the node-specific fractional exposure; bad pixels contribute no active time. ... If an event is rejected for this reason only, then its pixels remain normal in the exposure map. ...

The AstroGuide . ... AstroGuide | ... AstroGuide Listing . ... See many more Astronomy Listings by: Category or Alphabet . ... The ASN is Located in Northern Nevada. ... Listed Since August 21, 2005 . ... Web Site . http://www.sierrastar.org, http://gwastro.blogspot.com . ... Web . www.astronomy.net . About Astronomy Net | ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... International astronauts are those individuals from international space agencies who have trained or served with NASA Astronauts. Astronaut assignments and category definitions (e.g., "active" astronauts, "management" astronauts) are contained in a separate Flight Operations Directorate (FOD) policy letter. Former astronauts are those who are no longer employed by their agency. Active and Management International Astronauts . Astronaut . ... Former International Astronauts . ...

... 9) Oknyanskij V.L. 1994, "Optical-radio time delays in Q0957+561", Odessa Astronomical Publ., ... 11) Oknyanskij V.L. 1994, "Connection between X-ray and optical variability in NGC4151", in Proceedings of Int. Conf. ... 1994. 12) Oknyanskij V.L. 1994, "Connection between X-ray and optical variability in NGC4151", Astrophys. and Space Science, 222, p.157. ... 14) Oknyanskij V.L., van Groningen E., 1997, "Optical spectral variability of NGC4151 in 1990", Astronomical and Astrophys. ...

PROJECT ASTRO W elcome to Project ASTRO, a hands-on, inquiry-based program for grades 4-9. The goal of Project ASTRO is to use student interest in astronomy to enhance science teaching. ... ASTRO Boston In its eighth year, Project ASTRO Boston is operated jointly by the Harvard-Smithsonian Center for Astrophysics and the Boston Museum of Science and facilitated by the New England Space Science Initiative in Education (NESSIE), a NASA program. ... Commitments Workshops. ... Classroom v isits. ...

Nowadays at the Department the experimental and theoretical investigations, including astronomical and ionospheric observations, active experiments with space vehicles are taking place. ... Solar Corona physics and erruptive phenomenae. ... Stellar astronomy. ... The Department has organized and put into practice more then 50 expeditions for observation of Solar ecllipces, aurorae polaris, comets, meteor streams, controlled space experiments, and also for investigations of geophysical characteristics. ...

... Using multifrequency radio data obtained with the GMRT, VLA and RT, we are defining a sample of young radio AGN in the Spitzer FLS field which are associated with midinfrared sources. ... GMRT Observations The Spitzer extragalactic First Look Survey (FLS) field was observed with the Giant Metrewave Radio Telescope (GMRT, Figure 1), Pune, India, at 610 MHz in March 2004. ... Figure 1: Three of the antennas in the inner square kilometre of the Giant Metrewave Radio Telescope (GMRT). ...

Date: Thu, 12 Apr 2007 18:15:45 +0200 (MEST) From: Alessandro Marconi <marconi@arcetri.astro.it> To: boch@sai.msu.ru Subject: Summer school on AGNs and VLTI Dear Colleague, here is the first announcement and call for applications for a VLTI summer school on "Active Galactic Nuclei at the highest angular resolution: theory and   observations". ... It is supported by 15 EU member states, including new member states, and thus integrates the entire European optical interferometry community. ...

Figure 10. The circles show the thermal defocus corrections that were observed on August 15, 2000. These data were derived by combining the defocus measurements seen in Figure 6 with the thermal measurements of the truss seen in Figure 7. ... I then fit the thermal defocus data given by the circles above using only the thermal time constant and an arbitrary "zero-point" constant as fit parameters. ... M1 corresponds to a thermal time constant of 0.37 hours (22 minutes) for the rods. ...

... The "GALFA Consortium" is a group of individuals interested in galactic astronomy programs using the Arecibo L-Band Focal Plane Array (ALFA) and who are committed to coordinating efforts to the extent possible in order to maximize science return and program efficiency. ... The GALFA "Coordinating Committee" consists of representatives of GALFA Consortium projects that have been granted telescope time or those in the development stage that have been endorsed by the GALFA Consortium. ...

M87 Gas Disk and Optical Jet (STSci) . SEDS Messier Catalogue M87 Page (U. Arizona) . Black Hole and Jet in M87 (NASA/GSFC) . ... The large scale radio structure is shown in the 3CRR Atlas . Richard White's Virgo Cluster page has optical and X-ray images of the large-scale environment of M87 . ... HST Observes Distant Radio Galaxies (STScI) . HST Finds a Black Hole in NGC4261 (STScI) . HST finds a Bare Black Hole Pouring out Light in NGC6251 . ... Alan Bridle's Home Page . ...

... Bad Astronomy . ... Mad Science . ... Site Info . ... Public Talks . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Who is this guy who calls himself "The Bad Astronomer?" ... First, yes, I am a real live astronomer (when people ask me what astronomers do, I tell them "They astronom !" ... These are emitted by powerful objects like black holes, exploding stars, and super-dense neutrons stars. ... Finally, am I really a bad astronomer? ... 2008 Phil Plait. ...

... 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. ...

... This Announcement contains detailed information on organizational items, scientific and cultural program of Odessa session GMIC-99. ... 8.00- 23.00 Registration of participants in the hall of Tour-complex "Odessa"(Arcadia region, GAGARIN plateau, 5). ... 8.00- 13.00 Registration of participants in the hall of Tour-complex "Odessa". 10.00-12.00 Program Committee session and press conference dedicated to GMIC-99 (Odessa Scientists' House). ... 9.00- 11.00 Plenary session. ... 13.00- 14.00 Lunch. ...

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. ...

. Cosmology . Very Early Universe . Cosmic Microwave Background Anisotropy . Dark Matter Models . Large Scale Structure . High Energy Astrophysics . Active Galactic Nuclei . Astrophysics of Compact Objects . Accretion Disks . Scientific Staff:

MAGION is a name of the serial of small MAG netospheric and ION ospheric satellites manufactured in Czech Republic to be launched as Russian scientific S/C hitch-hikers. ... magnetic field . ... Institute for Terrestrial Magnetism, Ionosphere and Radioware Propagation, Russian Acad. ... Technical manager of the MAGIC project E.M.Vasilyev vasilyev@mx.iki.rssi.ru . ... Institute of Atmospheric Physics , Czech Acad. ... Subsatellite project scientist from Czech Republic P.Triska ptr@ufa.cas.cz . ...