81. White Dwarfs And Novae Short on text, but contains excellent images, diagrams and a table of the brightest white dwarfs http://csep10.phys.utk.edu/astr162/lect/novae/novae.html

White Dwarfs and Novae (Section Not Complete) Subrahmanyan Chandrasekhar predicted while a very young man in the 1930s that there was a limiting mass for white dwarf stars: no white dwarf could be stable against gravitational collapse if it exceeded this mass, which is about 1.4-1.5 solar masses, depending on the detailed composition of the white dwarf. The idea was not very well received by many established astronomers, who considered it absurd that a white dwarf could have a limiting mass. Much later, Chandrasekhar's brilliant idea was completely accepted within the astrophysics community and he eventually won a Nobel Prize for his deep theoretical contributions to astrophysics. Today, all textbooks on stars describe the Chandrasekhar Limiting Mass for white dwarfs as central to the structure of white dwarfs (Ref) Cooling of White Dwarfs The adjacent image shows a white dwarf embedded in a planetary nebula that may be the hottest star kn own. Its surface appears to have a temperature of about 200,000 degrees C, which is 30 times the surface temperature of the Sun (Ref) . Even though the temperature is so high, this is a dying star. It has used all its nuclear fuel and can no longer produce energy by thermonuclear fusion.

82. Astronomy Graphics, Pictures And Images astronomy pictures, graphics and images. Great resources for photographs andgraphics relating to astronomy. astronomy pictures, graphics and images. http://space.about.com/cs/astronomypictures/

zfp=-1 var z336=0; About Homework Help Space/Astronomy Search in this topic on About on the Web in Products Web Hosting Space/Astronomy with Nick Greene Your Guide to one of hundreds of sites Home Articles Forums ... Help zmhp('style="color:#fff"') Subjects ESSENTIALS Free Sky Maps Free Virtual Space Greeting Cards Astronomy/Space Calendar ... All articles on this topic Stay up-to-date! Subscribe to our newsletter. Advertising Free Credit Report Free Psychics Advertisement Astronomy Pictures and Graphics Guide picks Submit Your Site Black Hole Images A set of images and related information from the Hubble Space Telescope. About Our Solar System Take a tour of our solar system and find out more about our neighbors. Find images and information for our nine planets, the sun, meteors, asteroids, and comets. About Astronomy and Space Desktop Wallpaper Each month, a different great astronomy or space image to place on your computer desktop. Sun Images Images of our very on star, Sol. Mercury Images Images of Mercury, the closest planet to the Sun. Venus images Images of Venus, the second planet in our solar system.

83. Multiwavelength Messier Museum - An Astronomical Gallery And Tutorial A multiwavelength view of objects in space from NASA's infrared astronomy center (IPAC). A detailed tutorial accompanies each set of images. This site will be regularly updated with new objects. http://sirtf.caltech.edu/Education/Messier/tie.html

Welcome to the Multiwavelength Messier Museum! For selected astronomical objects in the famous Messier catalog , we have gathered images taken at different wavelengths by a variety of ground-based and space-borne observatories. The human eye is a remarkable organ, but provides a mere sliver of insight into the richness of information that all celestial phenomena provide. If we wish to understand the cosmos and its spectacular objects, we must collect and study radiation throughout the entire electromagnetic spectrum . With multiwavelength data in hand, we can gain a more complete picture of celestial objects, and learn much about how scientific research often requires the skills of a good detective! The primary purpose of this online Museum is to introduce users to the wealth of data available at wavelengths beyond the familiar visible light we are accustomed to seeing. You will discover some important characteristics of astronomical phenomena, and learn about which types of radiation are best suited to studying certain objects. By comparing images of objects obtained at different wavelengths, you will be able to interpret interesting features, and discover why certain objects emit little or no radiation at some wavelengths. As you tour the Museum, take time to examine the images, make comparisons, and think carefully about the information accompanying the images. You can either visit your favorite objects, or tour all of the galleries from start to finish. Enjoy your tour!

84. Armando Caussade's Amateur Astronomy Contains stories, reports, technical data, images and links. http://www.armandocaussade.com/astronomy/index.html

ARMANDO CAUSSADE'S AMATEUR ASTRONOMY by Armando Caussade INTRODUCTION About the Author English Spanish Update Log English Report on the Total Solar Eclipse of 1998 February 26 Spanish Dark Skies of Southern Puerto Rico Spanish The Large Magellanic Cloud from Latitude +18° Spanish Report on the Puerto Rico Messier Marathon of 1999 March 20 English Spanish The Astronomical Society of Puerto Rico: A Brief History (1985-2000) Spanish The Brightest Stars English Spanish Calculating a Star's Diameter Spanish ASTROPHOTOGRAPHY Album 1- Panoramas English Spanish Album 2- Comets English Spanish Album 3- Planets English Spanish Album 4- The Moon English Spanish Album 5- Eclipses English Spanish Album 6- Deep Sky English Spanish Album 7- Other English Spanish LINKS English Spanish Astronomy (Puerto Rico) English Spanish Topics Related to Astronomy English Spanish Web site created on May 9, 1998. Last updated on March 25, 2001. Made in plain HTML Comments and suggestions are welcome. Please send them to caussade@icepr.com Back to armandocaussade.com

85. Czech Astronomical Society Association for professional and amateur astronomers. Includes an overview of the organisation, contact details, and images. http://www.astro.cz/en/

Czech Astronomical Society Home CAS Download About server ... Contact APOD Moon phase lunation 992, age 15.35 Czech astronomical society Is a voluntary association of professional and amateur astronomers and friends of astronomy and related sciences in the Czech Republic. CAS has also corporate members (e.g. Astronomical Institute of the Academy of Sciences of the Czech Republic). CAS was founded on December 8, 1917 in Prague. www.astro.cz is made by Czech astronomical society, contact

86. Emilio Segrè Visual Archives The world's largest collection of photographs, films and other images in the history of physics and allied sciences such as astronomy and geophysics. http://www.aip.org/history/esva/

AIP HOME PAGE Online Journal Publishing Service AIP Journals Publishing Services Science Policy History Center Working at AIP Site Index The Human Face of Science: Mini-Exhibits To convey a vivid impression of the real character and life of scientists, we've assembled some of our favorite photos, along with stories and quotes. Niels Bohr Ludwig Boltzmann Marie Curie Paul Dirac ... Niels Bohr Library of the Center for History of Physics at the American Institute of Physics . The collection focuses on American physicists and astronomers of the twentieth century, but includes many scientists in Europe and elsewhere, in other fields related to physics, and in earlier times. Search the Photo Collection This service is supported by donations from the Friends of the AIP Center for History of Physics You can help with tax-deductible contributions of visual materials or funds. Currently there are thousands of images available online. Updates are being made continuously. Please contact the Archives directly if the individual you're looking for is not listed in the index or if you're interested in seeing additional images of those individuals who are listed. . For more information contact the Photo Administrator at photos@aip.org

87. IfA -- Comet Hale-Bopp Includes news and images obtained by University of Hawaii astronomers. http://www.ifa.hawaii.edu/images/hale-bopp/hale-bopp.html

Comet Hale-Bopp at the UH Institute for Astronomy C omet Hale-Bopp is now moving away from the inner Solar System. As it receives less energy from the Sun, the cometary activity is slowing down, the tail is disappearing and the comet will rapidly become too faint to be observed with small telescope. While this marks the end of Hale-Bopp's public performance, it is not the end of the story: we plan to continue observing it as long as possible. The decrease and cessation of a comet's activity give very interesting information on its composition and history, so we are trying to observe comets as far as possible from the Sun. A typical comet nucleus has a diameter of 1 to 10 km, and is extremely dark, so that task is far from easy and requires big telescopes and very long exposures; in the case of Comet Hale-Bopp, we hope a to have an easier task, as we know that the nucleus is very bright. For more information, check out Karen Meech's Distant Comet Reseach page , and for an example of tricky observation, have a look at the faintest Solar System object ever observed: Comet Halley at the distance of Uranus , which is also the last image of that comet.

88. Astronomy Resources At STScI Astronomical research center responsible for operating the Hubble Space Telescope as an international Category Reference Education Johns Hopkins University Research...... WFPC2 Image Associations, WFPC2 Image Associations Over 16,000 coadded, CR-rejectedWFPC2 images are now available providing researchers with an important new http://www.stsci.edu/

Science Initiatives HDF HDF South Starburst Galaxies GOODS ... Spectra of Nearby Galaxies Meetings Talks This Week Colloquia Popular Talks NHST Workshop ... Hubble Fellows Symposium Publications Press Releases STScI Library Annual Report STScI Newsletter ... Detector Testing Picture Gallery Hubble Images Hubble Heritage Educational Activities Amazing Space Origins ExInEd Too Close for Comfort: Hubble Discovers an Evaporating Planet Astronomers using NASA's Hubble Space Telescope have observed for the first time the atmosphere of a planet beyond our solar system evaporating into space. Most of the planet may eventually disappear, leaving only a small dense core. Read more Press Releases Hubble Resolves a Blaze of Stars in a Galaxy's Core' STScI-PR-03-07 03-06-03 Close-Up of M27, The Dumbell Nebula STScI-PR-03-06 02-10-03 Hubble Probes The Heart of a Nearby Quasar STScI-PR-03-03 01-09-03 See all Press Releases Reports Report from the Users Committee The Space Telescope Users Committee (STUC) met on 21st and 22 nd October 2002 at the Space Telescope Science Institute. Read the report from the committee.

89. Dark Sky Czech Republic Gives information, letters and press releases about the Czech light pollution law, parts of the law, images of various lighting fixtures, lightpollution software and contact details for members. http://www.astro.cz/darksky/

Dark Sky and Quality Outdoor Lighting in Czechia The principle is simple, let the light go just the right direction: down (and steep enough) . Lighting fixtures with no curved belly (a flat glass instead) do the job, like these in central Europe: eco-settlement in Kassel Strasse der Solarenergie in Gleisdorf in front of Brno railway station parking lot in front of the museum in Gleisdorf Most local information on this topic is in Czech only (see http://svetlo.astro.cz ), just a couple of things is in English as well. Tiny parts of the new Czech law on Protection of the Atmosphere, regarding the Light Pollution and further links, even to its full text A verbatim almost-English version of the draft of the Statutory Order, in either a pdf or a html format A lecture on it (pdf, 0.1 MB) (on a conference Venice: Let's save the night , May 3) some non-Czech comments on its preparation within archives of selected J.H.'s correspondence persons, adhering voluntarily to the law after June 1, see e.g. Light pollution begins to decline in Czechia Central European darksky mailinglist archive (English, Deutsch)

90. Weather Underground: Lutz, Florida Forecast Current conditions, threeday forecast, allergy and pollution indexes, radar and satellite images, marine forecast, tropical storms, advisories, phases of the moon, and interactive astronomy chart. http://www.wunderground.com/US/FL/Lutz.html

Find the Weather for any City State or ZIP Code , or Country Units: Metric English Both Language: English Timezone: Set My Timezone No Ads. Weather Email. $5/year. ... Become a member! New! Members Login Print This Page Features Favorites Wunder News Photos NEXRAD Radar Stations NEXRAD Regional Composites ... Google Search Maps Temperature HeatIndex Windchill Humidity ... Jet Stream International United States Canada Mexico Central America ... Antarctica Information Need Help? Link to Us About Us Custom Weather ... Add this sticker to your homepage! Tampa Vandenberg, Florida Partly Cloudy at 8:15 AM EST (Click for forecast) Discount Hotels Worldwide Hotels US Hotels Discount Hotels Hotel Search Engine ... Spas and Resorts US and Canada Hotel Guides USA Hotel Discounts Guide Canadian Hotel Discount Guide World Hotel Discounts Guide Global Hotel Discounts ... Hotel Discounts Search Disney World® Area Disney World - Disney Hotel Orlando - Orlando Hotel Universal Studio Orlando - Hotel Top Destinations New Orleans - Hotel Destin Florida Panama City Beach - Hotel Weight Loss Help Phentermine Weightloss HGH Human Growth Hormone Phentermine Adipex Orlando / Disney Discount Hotels Discount Orlando Hotels Disney World Resorts All-Inclusive Bahamas Hotels Discount Hotel Rates ... Hotel Reservations Financial Aid Mortgage Refinance Bad Credit Second Mortgage Refinancing Pharmacy Online Buy Xenical Online Purchase Zyban Prescription City Hotels New York Hotel Las Vegas Hotel Orlando Hotel Cheap Hotels Finance Debt Consolidation Free Credit Report Contact Lenses

91. Weather Underground: Pomona Park, Florida Forecast Current conditions, threeday forecast, allergy and pollution indexes, radar and satellite images, marine forecast, tropical storms, advisories, phases of the moon, and interactive astronomy chart. http://www.wunderground.com/cgi-bin/findweather/getForecast?query=pomona park

92. Center For Adaptive Optics | Home An NSF Science and Technology Center dedicated to removing the blurring of images caused by changing distortions in optical systems with applications to astronomy and Vision Science. http://cfao.ucolick.org/

Text-only version Picture Gallery Upcoming Events: Summer School on AO CfAO Spring Retreat 2003 2003 Summer Internship Program 2003 Grad/Postdoc Professional Development Workshop What's New: File EHR Time Reports Online! CfAO Newsletter 2.1 The Center for Adaptive Optics (CfAO) is a Science and Technology Center (STC) funded by the National Science Foundation. The Center researches AO in the fields of vision science and astronomy, to remove the effects of image blurring through turbulent media. Applications include, astronomical telescopes, laser guide stars, wavefront sensing, MEMS technology and retinal imaging. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Center for Adaptive Optics University of California 1156 High St Santa Cruz CA 95064 cfao@ucolick.org Fax (831)-459-5717 Last Modified: Mar 11, 2003

93. Stellaris Software Stellaris is an astronomy shareware program. It includes simulations of the night sky (including NGC objects) and solar system. It also plots userdefinable graphs, displays space images and comes with various utilites such as an astronomical calculator. http://www.stellaris-software.com

Requirements Stellaris runs on Windows NT, Windows 2000, and Windows XP Software Package Released Size Stellaris 1.0 Jun 30, 2002 MB What is it? Download PicPack 1.0 for Stellaris May 18, 2002 MB What is it? Download MapPack 1.0 for Stellaris May 18, 2002 MB What is it? Download NEWS! Stellaris 1.10 Due Summer 2003 Suggest features Feedback Comments? Suggestions? You are welcome to share your thoughts on Stellaris View or sign the Guest book Send an e-mail Stellaris is astronomy software, or astro software. It is astronomy shareware, which means it is free to try. It can simulate the night sky and solar system and display space images, i.e. space pictures. It can also create a graph of your astronomical calculations. Celestial bodies Stellaris knows about are Sun, Moon, Moons, planet, planets, Earth, NGC objects, deep space objects, IC objects, Messier objects, star, stars, constellation, constellations, mercury, venus, mars, jupiter, saturn, uranus, neptune, pluto. Last update Jan 11, 2003

94. North Shore Amateur Astronomy Club Membership organization which promotes a wider appreciation of astronomy. Monthly newsletter, upcoming events, programs, related links and gallery of astronomical images. http://www.star.net/people/~nsaac/

Welcome to the N orth S hore A mateur A stronomy C lub Home Page! NSAAC is an Astronomy club of the North Shore in Massachusetts, USA Text Only Page Sign My Guestbook View My Guestbook About NSAAC - Online Brochure NSAAC was established in March of 1989 to develop an association of amateur astronomers who meet and observe from... Membership Application If you wish to become a member of the club please fill out this application The Celestial Observer Our monthly newsletter is a publication to the members of NSAAC. It contains news and upcoming events, along with sky highlights this month. Current and Upcoming Events at NSAAC Here you will find a schedule of events including star parties, meetings and observing sessions, and other items of interest. S.H.A.R.E Program This program enables audiences to view real time images of the sky from the comfort of a handicap accessible classroom, lecture hall, or auditorium. Astronomical Images by Members All members are free to submit astronomical images that they take. Some great shots here! Astronomical Resources on the Web Lots of interesting links around the internet as well as local to Massachusetts.

95. Fractals images of several attractors, some Newton Raphson method fractals, and L systems. Includes programs and explanations how to write such programs. http://www.swin.edu.au/astronomy/pbourke/fractals/

F r a c t a l s , C h a o s -> M a i n I n d e x I wonder whether fractal images are not touching the very structure of our brains. Is there a clue in the infinitely regressing character of such images that illuminates our perception of art? Could it be that a fractal image is of such extraordinary richness, that it is bound to resonate with our neuronal circuits and stimulate the pleasure I infer we all feel? P. W. Atkins So called "Buddhabrot" If you (like me) thought the Mandelbrot is showing its age, then try this variation. Burning Ship Fractal Lorenz Attractor Rossler Attractor Duffing Attractor ... Random Attractors Found using Lyapunov Exponents Chaos : Bounded, deterministic dynamics that are aperiodic and display sensitive dependence to initial conditions. Rendering Wada-type basins of attraction Here's a party trick for over Christmas. Get 4 large shiny Christmas balls, some coloured wrapping paper, some lights from the Christmas tree, and you have you own fractal laboratory to amuse yourself with over the festive season. Self similarity Examples of self similarity in fractals with examples from mathematics and photos of the physical world.

96. Science Photo Library | Stock Science Images Search, buy, and order images from a specialized library. Subjects ranging from astronomy and nature to medicine and technology. http://www.sciencephoto.com/

National Science Week 8th-17th DNA - 50 Years St Patrick's Day - 17 March Country United Kingdom Argentina Australia Austria Bahrain* Belgium Brazil Canada - outside Quebec* Canada - Quebec Chile China* Colombia Cyprus* Czech Republic Denmark Egypt* Finland France Germany Greece Hong Kong* Hungary Iceland* Ireland* Israel* Italy Japan - Stock and Features Korea Luxembourg* Malaysia* Mexico Netherlands New Zealand Norway Poland Portugal Russia Saudi Arabia* Singapore* South Africa* Spain Sweden Switzerland Taiwan* Thailand* Turkey* United Arab Emirates* United States Other Welcome to Science Photo Library, the leading provider of science images. Please Login or Register if you would like access to the lightbox and ordering functions. New Images Special Photo Techniques Images In Action Press Releases ... Image of the Week Own a piece of history - buy a limited edition print of the original photo of Watson and Crick with their model of the DNA double helix. Showcasing over 1100 of the best science images added to the collection over the last 2 years, our newest catalogue is available now Browse through the images by categories, rather than by keyword, and get an in depth view of the whole collection.

97. Ashraf Ahmed SHAKER, Home-Page A astronomy researcher provides information about himself, images of Egypt and Islamic links. http://oacosf.na.astro.it/ashraf/shaker.html

Welcome To My Home Page Ashraf Ahmed SHAKER Napoli 9 Feb. 1997 My Background Since my birthday (18-7-1968) , I live in a big city called Helwan, which is a part from the capital of Egypt Cairo (nearly 30 Km.south Cairo center). ( May 1990)B.Sc. in Astronomy from Astronomy Dept.-Faculty of Science - Cairo University (October 1990 - November 1991) Military service. In March 1992, I got my permanent position at Galaxies Lab.- Astronomy Dept. - National Research Institute of Astronomy and Geophysics(NRIAG),Helwan- Cairo Egypt as assistant researcher ,including the work at Kottamia 74 inch telescope,which is a part from NRIAG Institute. October 1992, M.Sc. Astronomy Courses from Astronomy Dept.- Faculty of Science - Cairo University May 1995 M.Sc. Thesis at Cairo Univ. titled " Warps in Galaxies". In May 1995, I got my permanent position at NRIAG as lecture assistant. Since October 1995, Ph.D. Student at Astronomy Dept.- Cairo Univ. , my Ph.D. thesis titled " The Physical Properties of Early Type Interacting Galaxies". Since June 1996 Ph.D. fellowship at

98. HubbleSite The official online home of the Hubble Space Telescope has images, news, facts, astronomy education resources, games, and a multimedia trip through time. http://hubble.stsci.edu/

Out of the ordinary ...out of this world. Chances are you haven't seen what NASA's orbiting Hubble Space Telescope sees. Hubble sees the raw beauty of the universe from above Earth's atmosphere and sends back a portrait of the universe in exquisite detail. Here's your chance to leave the ground for a while... and see what Hubble sees. News of Hubble's science and remarkable discoveries Gorgeous pictures of stars planets galaxies nebulae , and more Richly illustrated facts about the telescope and its instruments Weather on Mars and comet collisions about us contact us glossary

99. Rob's Astronomy Site Contains images, Mel bartel's scope drive, night time weather statistics, gas hypering, deepsky images, and freeware. http://www.fornax.pwp.blueyonder.co.uk/

CCD Images Tricolour Recent Images Astrophotography Gas Hypering Software Night-time Cloud Cover Light Pollution Site Visits This Site is best viewed at 800 x 600 Rob Johnson © 2003 New Moon 1st April and 1st May 2003 Welcome to my Web site devoted to all aspects of astronomy especially astronomical imaging. Comments are always welcome by e-mail to me, Rob Johnson, What's New? Despite bad weather visitors to the annual Croxteth Park Star Party had some good views. Try out this astronomical weather forecast from Weatherweb A clear night provided some spectacular views through the TROK 30" Dobsonian at Anne and Andrew Bate's star party at Hatton farm in Cheshire as well as fist light through Dave Galvin's MX7C CCD camera. Many thanks for a great evening to Anne, Andrew and Simon. Images here Jupiter and Saturn rise before sunset. Jupiter is in Cancer to the east of the open cluster M44. Saturn can be found on the eastern border of Taurus, not far from M1, the crab nebula.. Comet Ikeya-Zhang deep-sky mini survey here.

100. Markstaff's Homepage Of Astronomy, Space, Eclipses, Comets And Meteors An astronomy and space site, original eclipse and comet images, impact hazards, meteor news, weather information. http://www.fortunecity.com/tattooine/cluster/92/

web hosting domain names email addresses related sites Markstaff's Homepage Astronomy, Space, Eclipses, Comets, Meteors and More The Diamond Ring of the Total Solar Eclipse from Aruba, Netherlands Antilles, on February 26, 1998. 8 minutes and 9 seconds of Total Solar Eclipse Totality experienced and counting! MARKSTAFF...Chemist, Amateur Astronomer, and Truthseeker! This page is dedicated to Astronomy, Space, Science Fiction, and the Mysterious Truths. My interests include: Astronomy Stargazer, Eclipse Chaser, Comet Watcher, Meteor Observer. Mysteries of the Universe Black holes and Spook Lights, Supernova and Star-filled nights. THE TRUTH IS OUT THERE Science Fiction Asimov, Bradbury, Clarke, Ellison, Heinlein, et. al. Some favorite links... - Interactive Sky Chart Asteroid and Comet Impact Hazards The Brightest Comet Chronicles Comet Observation Home Page - See Which Comets Are Currently Visible Upcoming Eclipses Total Solar Eclipse of 4 December 2002 - The Next Total Solar Eclipse The Geminids: An Exception to the Rule - The Meteor Shower of 13-14 December 2002 Explore Astronomy, Comets, Eclipses, Meteors, Impact Hazards, and Much More:

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