M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

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• Low Surface Brightness Galaxy Gallery
• Astronomy Plus CCD Images of Galaxies

... By means of deep optical images obtained at the Special Astrophysical Observatory 6-m telescope it was discovered that some Seyfert galaxies that were earlier considered to be non-interacting objects displayed signatures of elongated tidal envelopes belonging to satellite debris. ... Our results suggest that statistic studies based on popular imaging surveys (for example SDSS) can lead to an underestimation of the fraction of minor mergers among galaxies with active nuclei (AGN). ...

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... Can one galaxy hide behind another? ... NGC 3293: A Bright Young Open Cluster . ... Hot blue stars shine brightly in this beautiful, recently formed galactic or "open" star cluster. ... Planetary Nebula NGC 7027 in Infrared . ... Even so, NGC 7027 is 14,000 times larger than the Earth-Sun distance. ... Starbirth in NGC 1808 . ... The center of galaxy NGC 1808 is bursting with new stars, but why? Being a barred spiral galaxy makes NGC 1808 somewhat similar to our own Milky Way Galaxy. ...

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... 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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... 2003 March 10 . M101: The Pinwheel Galaxy . Credit Copyright : Jean-Charles Cuillandre (CFHT), Hawaiian Starlight , CFHT . ... A striking example is M101, shown above , whose relatively close distance of about 22 million light years allow it to be studied in some detail. ... One result is that M101 , also called the Pinwheel Galaxy , has several extremely bright star-forming regions (called HII regions ) spread across its spiral arms. ... About APOD | ... NASA Technical Rep.: ... NASA SEU Edu. ...

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• APOD: August 5, 1997 - M101: The Pinwheel Galaxy
• APOD: 2009 April 14 - M101: The Pinwheel Galaxy
• APOD Index - Galaxies: Spiral Galaxies

Supernova 2002fk in NGC 1309 . This page is devoted to information on Supernova 2002fk in NGC 1309 Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page . Information on the original web pages for many of these images can be found on the updates and links web pages. ... 2002/09/19.848 . ... JM Llapasset image . ... 13.0 . ... Josep M. Bosch . ... Josep M. Bosch image . ... vsnet-campaign-sn 476 ] SN 2002fk in NGC 1309 . ...

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• Supernova 1994D in NGC 4526
• Supernovae 2014dt in M61
• Supernovae 2010jl in UGC 5189A

... NGC 6221 . NGC 6215 . NGC 6221 is a barred spiral galaxy which is interacting with its brightest neighbour, NGC 6215, and possibly also with two newly discovered low-surface brightness galaxies (see Figure). The galaxy group lies only 10 degrees below the Galactic plane which explains the rather crowded field in the optical. ... Not much is known about NGC 6215, which is classified as a non-barred spiral galaxy of type SAS5 (RC3). ...

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• NGC 6221
• dense_gas
• ATNF Daily Astronomy Picture

... Primordial theory review : Dick Bond . Defects and the CMB review : Andy Albrecht . ... Gravitational wave contribution to CMB anisotropies : V.B. Lukash and E.V. Mikheeva . C_l from cosmic strings : Lloyd Knox . Some aspects of CMB anisotropies induced from topological defects : Mairi Sakellariadou . ... CMB anisotropies from scaling sources : Ruth Durrer . ... SZ observations I : Sarah Church . ... Holes in the microwave sky? ... Detecting cosmic strings in the CMB : James Robinson . ...

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• Astrophysics Group AMI Science
• OptInt PmWiki : PmWiki / Wiki Style Examples
• OptInt PmWiki : Wiki Style Examples

... An artificial comet holds secrets to Earths life . ... Astronomers recently discovered that Scholz's star passed close to the Sun 70,000 years ago. Wouldn't its gravity have sent Oort Cloud comets raining into the inner planets? ... COMETS | OORT CLOUD . Based on the number of long-period comets that enter the inner solar system, astronomers estimate there are probably trillions of them in the Oort Cloud. Get instant access to subscriber content on Astronomy.com! ... Discover | ...

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• Astronomers recently discovered brown dwarfs of only a few hundred degrees
• Another violent galaxy cluster collision discovered | Astronomy.com
• Why do some stars appear to flash a variety of different colors when you look

... Large-scale production and analysis of mock galaxy images. ... Recently I've been involved in a collaboration ( The Illustris Project ) to create and analyze large-scale simulations of galaxy formation. ... Click to see a comparison between the Hubble Ultra Deep Field and a galaxy formation experiment run on a supercomputer: . ... Today, stars and planets form in clouds of gas and dust in galaxies, clumps of matter denser than the universal average by roughly 30 orders of magnitude. ...

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• The Nature of Infrared Emission in the Local Group Dwarf Galaxy NGC 6822 as
• HST Photometry of the Post-Starburst Galaxy NGC 1569
• WFPC2 STAN

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Earth Satellites . ... Leonid meteors seen from 13 km altitude aboard an aircraft during the 1999 Leonids Multi-Instrument Aircraft Campaign (Leonid-MAC). Comet Tempel-Tuttle provides the cometary debris for the Leonid meteor shower. ... Every 17-19 November Earth crosses Tempel-TuttleтАЩs orbit and the Leonids become visible. With clear, dark skies observers may see 10 to 15 Leonid meteors every hour on those mornings. ...

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• Kepler 36b and c: Too Close for Comfort | Astronotes
• Water on Mars: Evidence from NASA | Astronotes
• Cepheids Inconstant Stars which break the rules | Astronotes

GALACTIC SILHOUETTES This new image from NASA's Hubble Space Telescope and its Wide Field Planetary Camera 2 (WFPC2) shows the unique galaxy pair called NGC 3314. Through an extraordinary chance alignment, a face-on spiral galaxy lies precisely in front of another larger spiral. ... The bright blue stars forming a pinwheel shape near the center of the front galaxy have formed recently from interstellar gas and dust. ...

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• APOD: December 6, 1999 - M83: The Southern Pinwheel Galaxy from VLT
• APOD: 2000 April 4 - A Superwind from the Cigar Galaxy
• APOD: September 22, 1998 - M61: Virgo Spiral Galaxy

A star has recently been discovered travelling in a circular orbit around our galaxy (the Milky Way). ItтАЩs orbit is 80 kilo-parsecs out, and it is traveling at a speed of 320 km/s. Deduce the mass of our galaxy from this. Compare your answer to the mass of everything we can see in our galaxy (1.2x10 42 kg). A kilo-parsec is 1000 parsecs, and a parsec is 3.1x10 16 m. Click here to download the webcast (8 minutes, 11 MB, m4v format, can be viewed with Quicktime, iTunes or iPods)

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• VV29 = Arp 188 = The Chainsaw Galaxy
• THE AUSTRALIAN NATIONAL UNIVERSITY
• GSAOI Dwarf Galaxies Science Page

... Next: Cheating Poisson: A Up: Statistical Analysis Previous: Spatial Models and . ... The spatial distribution of stars in the Local Group dwarf irregular galaxy NGC 6822 has been studied, using recent positions and deep photometry for about 15,000 stars in the galaxy. Based on photometrical data, OB stars and red stars could be studied separately. Spatial statistical tools have been applied to the analysis of the spatial structure. ... Figure: Model selection by the aid of CAIC . ...

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... A2043 Date Received: 2005-Jan-31 15:38:05 Technical Page Proposal Type: General Category : Sub- Category : Observation Category : Total Time Requested: Prop osal Title: ABSTRACT: Short Astronomy Spectroscopy Extragalactic 3 Hours H I 21 cm Search for a Ly alpha Absorbing Galaxy We request observing time on the Arecib o Radio Telescop e to lo ok for the HI emission sp ectrum of a nearby lyman- alpha -dense ... Part of the observing run. ...

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• http://www.naic.edu/vscience/schedule/tpfiles/StocketagA2043tp.ps
• HISA Poster for the 195th Meeting of the AAS, January, 2000
• REU Science Area

... Bringing news from across the Universe to children all around the world . ... Galaxies are like cities of stars in the Universe. ... Dark galaxies are very far away in the Universe. They are thought to be the building blocks that helped to create the big star-filled galaxies that we see today, like our own Milky Way Galaxy. ... That s why the astronomers looked for dark galaxies around incredibly bright galaxies called quasars , which are also very far away. ...

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• Ultra-compact dwarf galaxies
• Pulsating Star Mystery Solved | ESO
• The Unexpected Past of a Dwarf Galaxy | ESO

In autumn 1994, two groups of astronomers announced that they had discovered Cepheid variable stars in a distant cluster of galaxies. ... As the term suggests, variable stars change in brightness over time. ... Variable stars are an ideal way to get high-school students doing real science, with real data, from the real sky. ... a sky chart to find the stars . ... Students can use the nearby stars to estimate the magnitude of Delta. ... Locate the star Delta in Cepheus and estimate its brightness . ...

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• ASP: Book Review
• ASP: An Ancient Universe - The Age of Light from the Most Distant Galaxies
• ASP: Beacons in the Gloom

Next: Observations and data reduction Up: HS 0822+3542 - a Previous: HS 0822+3542 - a . ... I Zw 18, a BCG with the lowest known oxygen abundance among the galaxies (O/H 1/50 (O/H) , Searle & Sargent [ 1972 ]; Izotov & Thuan [ 1999 ]), has been suggested as a candidate to be a truly-local young galaxy, experiencing its first short SF episode. ... 1998 ]). ... In this paper we describe the data obtained for the third most metal-deficient galaxy, HS 0822+3542 with O/H = 1/36 (O/H) . ... 0822+3542 1 . ...

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• Results and conclusions
• New nearby very metal-deficient blue compact galaxies
• Conclusions

Astronomers at Armagh Observatory and Cardiff University have independently discovered new mechanisms by which micro-organisms may have spread throughout the Galaxy. Scientific papers on the topic by Professor Bill Napier at Armagh, and by Dr Max Wallis and Professor Chandra Wickramasinghe at Cardiff University, will appear simultaneously in the Monthly Notices of the Royal Astronomical Society . ... Cardiff scientists Max Wallis and Chandra Wickramasinghe have identified another delivery route. ...

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• Armagh Observatory
• HISTORICAL BACKGROUND
• Historical Background

... People . Posts tagged ?Galaxies? ... ArXiv] 2nd week, Feb. ... Comment . ... vlk on [MADS] Parallel Coordinates . upvc windows on [MADS] Parallel Coordinates . ... Alfred Inselberg on [MADS] Parallel Coordinates . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray . ...

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• The AstroStat Slog host galaxy
• The AstroStat Slog Blog Archive [ArXiv] GRB host galaxies, Aug. 10, 2007
• The AstroStat Slog GRB