121. Black Holes: The Ultimate Abyss--Astronomy/Space Lesson Plan (grades 6-8)--Disco Students learn that even though black holes all have characteristics in common, they come in three different sizes. Each size of black hole has http://school.discovery.com/lessonplans/programs/blackholes/

postionList = "compscreen,hedthick,admedia,tower,nuiad,interstitial"; OAS_RICH("interstitial"); OAS_RICH("admedia"); Grades K-5 Grades 6-8 Grades 9-12 Astronomy/Space ... Health History Ancient History U.S. History World History Life Science Animals Ecology Human Body The Microscopic World ... Weather 6-8 > Astronomy/Space Grade level: 6-8 Subject: Astronomy/Space Duration: Two class periods Objectives Materials Procedures Adaptations ... Credit Objectives Find a video description, video clip, and discussion questions. Black Holes: The Ultimate Abyss Use our free online Teaching Tools to create custom worksheets, puzzles and quizzes on this topic! Students will understand the following: Even though black holes all have characteristics in common, they come in three different sizes. Each size black hole has characteristics different from the others. Materials Only research materials are required for this activity. You might want to have a selection of sources on hand in the classroom, but students should go to the library or the Internet for additional research. Reference materials on black holes A computer with Internet access Procedures Review with your students what they have learned about black holes.

122. Binary Black Hole Home Page black holes in production in New York The RegisterThe Ultimate spam filter; The Black Hole Toilet never flush again; The Infinity furniture storer (we re Scientists spot really, really big black hole http://www.npac.syr.edu/projects/bh/

Supported by NSF ASC/PHY 9318152 (ARPA supplemented) New Developments edit New Developments page (members of the Alliance only) URGENT New PreReview papers: Bishop-Gomez-Lehner-Szilagyi-Winicour MISSION TIMELINE DIRECTORY ... PUBLICATIONS shortcuts: AlphabeticDirectory PreReview DataVault webmaster: Tom Haupt haupt@npac.syr.edu since 8/19/96

123. BBC - Science & Nature - Space - Time Travel Gravity, black holes, singularity and mini wormholes. http://www.bbc.co.uk/science/space/exploration/timetravel/index.shtml

@import url('/includes/tbenh.css') ; Home TV Radio Talk ... A-Z Index MONDAY 19th September 2005 Text only Animals Prehistoric Life Space ... BBC Homepage In Space Solar System My space Play space ... Help Like this page? Send it to a friend! You are here: BBC Space Exploration TIME TRAVEL Shaping the Future by Neil Johnson The idea of travelling forward into the future or back into the past has always fascinated science fiction writers. The 'grandfather paradox' is the argument many people use to suggest that time travel is impossible. What if you went back in time and prevented your grandfather from meeting your grandmother so that your mother was never born? Then you would never have been born... and so on. Until very recently such arguments led most scientists to believe that time travel could never exist outside science fiction. But amazingly, some interpretations of the weirdness of the quantum world now suggest that time travel is possible - at least in theory. Gravity and black holes Einstein's theory of relativity brought space and time together in a single, four-dimensional arrangement that he called spacetime. We know that we can travel forwards, backwards and sideways in space, so why not forwards and backwards in time? Four dimensions are difficult to imagine, so physicists usually suggest you think of spacetime as a rubber sheet stretched out flat. If there are no large masses around, the sheet stays flat, and so any object placed on it will move around in straight lines. But a large mass, such as the

124. CNN.com - Space - New X-ray Telescope Could Peer Inside Black Holes - September CNN http://www.cnn.com/2000/TECH/space/09/14/blackholetelescope.ap/index.html

space Editions myCNN Video ... Feedback CNN Sites CNN CNN Europe CNNfn CNNSI myCNN CNNfyi AllPolitics Languages Search CNN.com CNNSI.com CNNfn.com The Web SPACE TOP STORIES Mir cargo vessel abandoned John Zarrella: Lessons learned from Challenger Last rendezvous for Mir Beginning of the end for Mir ... MORE TOP STORIES Bush signs order opening 'faith-based' charity office for business Rescues continue 4 days after devastating India earthquake DaimlerChrysler employees join rapidly swelling ranks of laid-off U.S. workers Disney's GO.com is a goner ... MORE MARKETS 4:30pm ET, 4/16 DJIA NAS SPORTS Jordan says farewell for the third time ... LOCAL EDITIONS: CNN.com Europe change default edition MULTIMEDIA: video video archive audio multimedia showcase ... more services E-MAIL: Subscribe to one of our news e-mail lists Enter your address: DISCUSSION: chat feedback CNN WEB SITES: CNNfyi.com CNN.com Europe AsiaNow Spanish ... Korean Headlines TIME INC. SITES: Go To ... Time.com People Money Fortune EW CNN NETWORKS: CNN anchors transcripts Turner distribution SITE INFO: help contents search ad info ... jobs WEB SERVICES: New X-ray telescope could peer inside black holes Hubble Space Telescope image of an accretion disk formed by a black hole in galaxy NGC 7052 (AP) Astronomers have developed a design for an X-ray telescope so staggeringly powerful that it could see black holes gulping matter in distant galaxies.

125. Science NetLinks: Black Holes To introduce black holes and demonstrate how space telescopes can provide data This is a module that introduces students to the science of black holes. http://www.sciencenetlinks.com/lessons.cfm?DocID=272

126. Black Holes And Event Horizons - Ghosts Of Stars Find articles, information, and web sites about these theoretical cellestial objects, formed when a massive star collapses from its own gravity. http://space.about.com/cs/blackholes/index.htm

zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Homework Help Space / Astronomy Homework Help ... Help zau(256,140,140,'el','http://z.about.com/0/ip/417/C.htm','');w(xb+xb+' ');zau(256,140,140,'von','http://z.about.com/0/ip/496/7.htm','');w(xb+xb); FREE Newsletter Sign Up Now for the Space / Astronomy newsletter! See Online Courses Search Space / Astronomy Blackholes and Event Horizons Guide picks Submit Your Site Black Holes Guide Resources dealing with black holes, singularities, and event horizons. Includes images, articles, web links and more black holes information. Lots of great resources on black holes, the ghosts of stars, with more added weekly. Top Fictional Black Hole Movies What are Black Holes - where do Black Holes come from and how do stars fit in? Find the answers to these and other questions in the top ten Black Hole books. Top 10 Nonfiction Black Hole Books The idea of black holes was first theorized in the late eighteenth century. Black holes are still just a theory, but a very good theory. Now that astronomers have acquired evidence that theoretical white dwarfs and neutron stars really exist, the case for black holes has been strengthened. Discover more about these fascinating theoretical phenomena. Black Hole Images Images of black holes provided by the Hubble Space Telescope.

127. Sea And Sky: Black Holes This is because black holes challenge the very foundation of the physical black holes are so massive that their escape velocity is faster than the speed http://www.seasky.org/cosmic/sky7a10.html

Return to The Sky Return to The Cosmos Return to Cosmic Wonders Black Holes A Hole in Space Recipe for a Monster Anatomy of a Black Hole Stalking the Unseen A Hole in Space Recipe for a Monster Anatomy of a Black Hole Stalking the Unseen

128. 'Death Spiral' Around A Black Hole Yields Tantalizing Evidence Of Event Horizon Death Spiral Around a Black Hole Yields Tantalizing Evidence of Event Horizon. NASA's Hubble Space Telescope may have, for the first time, provided direct evidence for the existence of black holes by observing the disappearance of matter. http://space.about.com/cs/nasanews/a/2001_03stsci.htm

var zLb=3; var zIoa1 = new Array('Hubble Black Holes Resources','View Full Size Image','http://space.about.com/library/weekly/bl2001_03stsci.htm','Return To Black Holes Info Page','http://space.about.com/library/weekly/blblackholescplx.htm'); zJs=10 zJs=11 zJs=12 zJs=13 zc(5,'jsc',zJs,9999999,'') About Homework Help Space / Astronomy Hubble Space Telescope News 'Death Spiral' Around a Black Hole Yields Tantalizing Evidence of Event Horizon Homework Help Space / Astronomy Essentials Education ... Help zau(256,140,140,'el','http://z.about.com/0/ip/417/C.htm','');w(xb+xb+' ');zau(256,140,140,'von','http://z.about.com/0/ip/496/7.htm','');w(xb+xb); FREE Newsletter Sign Up Now for the Space / Astronomy newsletter! See Online Courses Search Space / Astronomy 'Death Spiral' Around a Black Hole Yields Tantalizing Evidence of an Event Horizon Stay up to date! Compare Prices 'Death Spiral' Around a Black Hole Yields Tantalizing Evidence of an Event Horizon Email to a friend Print this page Hubble Black Holes Resources View Full Size Image Return To Black Holes Info Page Recent Discussions how does the universe look?

129. Black Holes: The Ultimate Abyss black holes The Ultimate Abyss by Dr Richard Smith. http://www.abc.net.au/science/slab/blackholes/story.htm

the ultimate abyss by Dr Richard Smith (Click here for an overview of this article) It used to be thought that the world was flat. That beyond the horizon lurked a bottomless void, measureless to humans. As our ships got better and our navigators more confident, vessels that disappeared over one horizon began returning triumphant from the other. The Earth was curved, a sphere with no edges. We didn't fall off because a mysterious force called gravity kept everyone and everything stuck to the planet's surface. Then Albert Einstein came along and told us that space itself was curved. Now we realise that if we sail off into the sea of curved space we call the Universe, there are indeed bottomless voids that the unwary traveler can fall into - and they are measureless to humans. They lurk on the other side of their own dark horizons, and we call them Black Holes. FATAL ATTRACTION A black hole is an astronomical contradiction - a dark star, an invisible nothing, a prison of light. Its boundary is marked by the so-called Event Horizon , a sphere of darkness that shrouds the inside and defines the point of no return. There is no solid surface beyond, just a bottomless gravitational whirlpool so strong that it sucks everything - even light - relentlessly inward. Oblivion waits at the centre in the form of the

130. Research Faculty - Amanda Peet Assistant professor at the University of Toronto, interests include highenergy theoretical physics, string theory, quantum gravity and black holes. http://www.physics.utoronto.ca/~peet/home/

Prof. Amanda Peet, University of Toronto High-energy theoretical physics: string theory as quantum gravity Contact Details Address: Department of Physics University of Toronto 60 St. George Street Toronto ON Canada M5S 1A7 Phone: Fax: Office: Room 1118, McLennan Labs (in Burton Tower) E-mail: amanda dot peet at utoronto dot ca N.B.: attachments and platform-dependent formats will be ignored. [Photograph is Brief CV Alfred P. Sloan Research Fellowship Radcliffe Fellowship PREA CIAR Scholar , Cosmology and Gravity Programme (2000-5) Assistant Professor , University of Toronto, Canada (2000-) Postdoctoral Fellow Institute for Theoretical Physics ITP UCSB , US (1997-2000) Postdoctoral Research Associate Princeton University , US (1994-1997) Ph.D. Stanford University , US (1994) B.Sc.(Hons) University of Canterbury New Zealand Research Interests Please click here if you prefer a non-technical description... I am a member of the Toronto high-energy theory group My goal is to understand the fundamental dynamics of quantum gravity. I study this using string theory, with applications to black holes and cosmology, and links to gauge theory and particle physics. My work to date has concentrated on problems on the gravitational side of string theory. I began with aspects of the black hole information problem, moved to entropy computations when D-brane physics arrived, developed aspects of holographic gravity/gauge dualities useful to black holes and black branes, and most recently concentrated on the search for string theoretic mechanisms for resolution of spacetime singularities. I am also interested in mechanisms for string theoretic prevention of other pathologies in spacetimes, such as regions with closed timelike curves.

131. General Relativity & Black Holes Gene Smith s Astronomy Tutorial General Relativity black holes. http://cassfos02.ucsd.edu/public/tutorial/GR.html

University of California, San Diego Gene Smith's Astronomy Tutorial Einstein's General Theory of Relativity The General Theory of Relativity is an expansion of the Special Theory to include gravity as a property of space. Start with this Gravity Tutorial The Equivalence Principle The Theory of Special Relativity has as its basic premise that light moves at a uniform speed, c = 300,000 km/s , in all frames of reference. This results in setting the speed of light as the absolute speed limit in the Universe and also produced the famous relationship between mass and energy, E = mc . The foundation of Einstein's General Theory is the Equivalence Principle which states the equivalence between inertial mass and gravitational mass Inertial Mass is the quantity that determines how difficult it is to alter the motion of an object. It is the mass in Newton's Second Law: F = ma Gravitational mass is the mass which determines how strongly two objects attract each other by gravity, e.g. the attraction of the earth: It is the apparent equivalence of these two types of mass which results in the uniformity of gravitational acceleration Galileo's result that all objects fall at the same rate independent of mass: Galileo and Newton accepted this as a happy coincidence, but Einstein turned it into a fundamental principle. Another way of stating the equivalence principle is that gravitational acceleration is indistinguishable from other forms of acceleration. According to this view a student in a closed room could not tell the difference between experiencing the gravitational pull of the earth at the earth's surface and being in a rocketship in space accelerating with a = 9.8 m/s

132. Index Miscellaneous topics as black holes, space exploration. http://www.geocities.com/sinava

133. LIGHT FROM BLACK HOLES The meeting will consider accreting black holes in two major contexts I) stellar mass black holes, II) supermassive black holes in the centers of active http://cc.oulu.fi/~jpoutane/nepal.html

LIGHT FROM BLACK HOLES Kathmandu, Nepal September 30 - October 4, 2002 Final Scientific Program Some pictures from the conference (not only) Content The meeting will consider accreting black holes in two major contexts: I) stellar mass black holes, II) supermassive black holes in the centers of active galaxies. Particularly, the following topics with be considered on the workshop: observations and analysis of X/gamma-ray spectra of accreting black holes; observations and analysis of temporal variability of accreting black holes; radiative processes; physical processes in the vicinity of black holes; accretion disk theory. Presentations There will be a standard overhead projector and a projector for computer presentations available for your presentations. Weather Temperature in Kathmandu is about 25-30 C during the day time and 15-20 C during the night. It should be quite sunny but occasional rains are possible. If you are going into the mountains after the conference, the temperature their can easily drop below C if you are above 4 500 m above the sea level, snow is probable. Do not forget your sunscreen anyway.

134. BUBL LINK: Black Holes Also outlines the physical properties of black holes, and examines the connection between Subjects astronomy education, black holes, cosmology, stars http://bubl.ac.uk/link/b/blackholes.htm

BUBL LINK Catalogue of Internet Resources Home Search Subject Menus Countries ... Z Black holes Titles Descriptions Astronomy Information Leaflets Black Hole: The Death of a Star Black Holes FAQ Exploring Gravity ... Virtual Trips to Black Holes and Neutron Stars Comments: bubl@bubl.ac.uk Astronomy Information Leaflets Text from a series of educational leaflets covering a wide range of topics in astronomy and cosmology. Educational use of the information by private individuals or schools is encouraged. Author: Royal Greenwich Observatory Subjects: astronomy education, black holes, cosmology, pulsars, satellites, spectroscopy, stars DeweyClass: Resource type: document collection Black Hole: The Death of a Star Provides an introduction to the black hole phenomena, including the formation of singularities. Also outlines the physical properties of black holes, and examines the connection between them and the theory of relativity. Author: Subjects: black holes DeweyClass: Resource type: documents Black Holes FAQ Answers to questions such as 'how big is a black hole', 'what is a wormhole' and 'what is a white hole'. Author: Bunn, Ted

135. [gr-qc/9803002] Higher Dimensional Chern-Simons Theories And Topological Black H It has been recently pointed out that black holes of constant curvature with a chronological singularity can be constructed in any spacetime dimension. In this paper, a brief summary of these new black holes is given. http://arxiv.org/abs/gr-qc/9803002

General Relativity and Quantum Cosmology, abstract gr-qc/9803002 From: Max Banados [ view email ] Date: Sat, 28 Feb 1998 23:30:09 GMT (9kb) Higher Dimensional Chern-Simons Theories and Topological Black Holes Authors: Maximo Banados Categories: gr-qc Comments: 13 pages, Latex. Talk given at the Conference "Quantum Mechanics of Fundamental Systems VI", Santiago, Chile, Aug 1997 It has been recently pointed out that black holes of constant curvature with a "chronological singularity" can be constructed in any spacetime dimension. These black holes share many common properties with the 2+1 black hole. In this contribution we give a brief summary of these new black holes and consider them as solutions of a Chern-Simons gravity theory. We also provide a brief introduction to some aspects of higher dimensional Chern-Simons theories. Full-text: PostScript PDF , or Other formats References and citations for this submission: SLAC-SPIRES HEP (refers to , cited by , arXiv reformatted); CiteBase (autonomous citation navigation and analysis) 2 trackbacks What's this?

136. September 2004 - Black Holes ... Emerging Web App Security Services And Products black holes. Emerging Web app security services and products bring source code vulnerabilities to light. BY JAMES C. FOSTER http://infosecuritymag.techtarget.com/ss/0,295796,sid6_iss467_art975,00.html

@import "/css/ismag-prime.css"; Guide: ROOTING OUT FLAWS More Why I Love SPIKE More ... More URL : document.write(document.URL) Printable Page Web Page September 2004 Black Holes Emerging Web app security services and products bring source code vulnerabilities to light. BY JAMES C. FOSTER Are your Web applications secure? Online businesses apps, which are wide open at port 80, put that question to the test daily. Developed for functionality with little thought to security, custom apps are typically vulnerable to attacks such as buffer-overflow exploits, cross-site scripting and SQL injection. If companies don't lock down their Web apps, security risks will increase as corporate dependency on Internet and intranet applications rises, along with site complexity, language depth and overall functionality. The Web apps' exposure to attack is driving the need for developers with both expert application security and deep programming skills. Faced with the need to develop secure applications in the absence of uniform expertise, organizations have two basic options: A range of services that employ security development specialists to design, vet and/or troubleshoot applications.

137. StarChild: Black Holes What is a black hole and how do we know it exists?(for K4th graders) http://starchild.gsfc.nasa.gov/docs/StarChild/universe_level1/black_holes.html

Listen Black Holes Some scientists believe that there is a black hole in our very own Milky Way. Black holes were once massive stars that used up all their fuel . As they died out, they collapsed inward due to the pull of their own gravity . The gravity of a black hole is so powerful that not even light can escape its pull! Once any matter falls into a black hole, it disappears from the visible Universe It is very hard to see a black hole. Any object that gets too close to a black hole will be pulled inside it. We only know they are there because of the effects they have on other objects that are near them. Any object, whether some dust, or a star, or anything, that gets too close to a black hole will be pulled inside it. As the objects fall toward the black hole, they heat up and get very hot. Scientists can use special instruments to detect the heat the objects give off. That is how we know the black hole must be there. A Question How do we know that there really are black holes? Show me the Level 2 version of this page.

138. Central Force With Java A JAVA applet to simulate orbits in four different central forces gravity, Yukawa, 1/R^4 and black holes http://www.astro.queensu.ca/~musgrave/cforce/

Central Force Motion with Java The applet below illustrates the orbits of particles in a variety of color-coded forces. (Your browser is not Java aware) Overview of this site Investigate the qualitative behaviour of orbits in different forces (gravity, Yukawa potential, Harmonic force (i.e. spring), 1/R force) See how effective potentials are used to find turning points of orbits in a central force and for black holes Use the OrbitApplet to try and change the orbit of a spaceship to intercept a target (your chance to "make it so") Learn something about Java by delving into the source code including Booch-like diagrams of the object heirarchy employed Central Force Central force refers to a force which always acts towards a fixed point (the center). As the above Applet demonstrates different central forces result in qualitativly different orbits. Some forces produce closed orbits, others a "spirograph" pattern. (The black hole is not described by a force per se see the black hole explanation).

139. HyperCellOne Astronomy Index Glossary, laws, people, black holes, forum, and links. http://www.hypercellone.com/

A B C D ... Z Born in Wurttemburg, Germany in 1879, Albert Einstein would become one the most respected scientist in the world. Much of his career would be divided between science and politics. He would finish where Max Planck left off and challenge world leadership of the time. However, before Albert Einstein made his mark as a scientist/activist, he worked as a teacher teaching mathematics temporarily at the Technical High School in Winterthur and later teaching at a private school in Schaffhausen. Scientist speculate that our sister planet may be harboring lifeforms that could survive it's boiling hot temperatures. Venus' earth-like clouds are thought to be the key because of their "life friendly" temperatures and pressure. Scientist are eager to unlock this mystery. M82 galaxy offers scientist a glimpse into the universe's past. Over taken by powerful space hurricanes, M82 is home to some of the most violent and specticle storms in the universe. With these storms come a cycle that has scientist gazing for answers. This cycle, more than just a collection of storms, is the universe's representation of it's life and it's death.

140. Black Holes: Research Links For Students This page contains links to a series of web pages that support online study of black holes. http://www.cdli.ca/CITE/solar_black_holes.htm

As Featured April /01 Gander Academy's Black Holes Theme Page Mercury Venus Earth Mars ... Frequently Asked Questions About Black Holes (Advanced Reading Level) How is time changed in a black hole? Well, in a certain sense it is not changed at all. If you were to enter a black hole, you would find you watch ticking along at the same rate as it always had (assuming both you and the watch survived the passage into the black hole). Learning About Black Holes What is a Black Hole? A celestial body whose surface gravity is so strong that not even light can escape once trapped. Black Holes Black holes are objects so dense that not even light can escape their gravity, and since nothing can travel faster than light, nothing can escape from inside a black hole. FAQs About Black Holes Who was the first person to discover a black hole and what was the date? How has it been demonstrated that black holes are real? Find the answers to these and many other questions at this web site. Black Holes There are many popular myths concerning black holes, many of them perpetuated by Hollywood. Television and movies have portrayed them as time-traveling tunnels to another dimension, cosmic vacuum cleaners sucking up everything in sight, and so on. More FAQS About Black Holes What is a black hole? How big is a black hole? What would happen to me if I fell into a black hole? Find the answers to these and many other questions at this web site.

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