61. Black Hole: Definition From Answers.com See S. W. Hawking, Black Holes and Baby Universes and Other Essays (1994); P. Strathern, The Big Idea Hawking and Black Holes (1998); J. A. Wheeler, Geons, Black Holes, and Quantum http://www.answers.com/topic/black-hole

62. [gr-qc/9912119] The Thermodynamics Of Black Holes Review by Bob Wald (University of Chicago). Suitable for undergraduates; includes discussion of classical black hole thermodynamics, Hawking radiation from black holes, the generalized second law, and the issue of entropy bounds. http://arxiv.org/abs/gr-qc/9912119

arXiv.org gr-qc Search or Article-id Help Advanced search All papers Titles Authors Abstracts Full text Help pages Full-text links: Download: PDF PostScript Other formats Current browse context: gr-qc new recent SLAC-SPIRES HEP refers to ... what is this? Bookmark what is this? General Relativity and Quantum Cosmology Title: The Thermodynamics of Black Holes Authors: Robert M. Wald (Submitted on 31 Dec 1999 ( ), last revised 30 Sep 2000 (this version, v2)) Abstract: We review the present status of black hole thermodynamics. Our review includes discussion of classical black hole thermodynamics, Hawking radiation from black holes, the generalized second law, and the issue of entropy bounds. A brief survey also is given of approaches to the calculation of black hole entropy. We conclude with a discussion of some unresolved open issues. Comments: 46 pages, no figures, plain latex file; submitted to Living Reviews in Relativity. Revised version contains numerous minor changes Subjects: General Relativity and Quantum Cosmology (gr-qc) ; High Energy Physics - Theory (hep-th) Journal reference: LivingRev.Rel.4:6,2001

63. Black Holes On Myspace Music - Free Streaming MP3s, Pictures & Music Downloads Myspace Music profile for Black Holes. Download Black Holes Hyphy / Club / House music singles, watch music videos, listen to free streaming mp3s, read Black Holes's blog. http://www.myspace.com/weareblackholes

64. The Thermodynamics Of Black Holes Review article by Bob Wald, published in Living Reviews in Relativity. Contains detailed information about classical black hole thermodynamics, hawking radiation and black hole entropy. http://relativity.livingreviews.org/Articles/lrr-2001-6/

65. The Space Place :: Black Hole Rescue! Black holes are not really holes at all. They are the opposite of empty! Black holes have the most matter stuffed into the least space of any objects in the universe. http://spaceplace.nasa.gov/en/kids/blackhole/index.shtml

66. HowStuffWorks "How Black Holes Work" Black holes occur when a star dies. Find out how black holes are made, types of black holes, parts of black holes and how we detect black holes in space. http://science.howstuffworks.com/dictionary/astronomy-terms/black-hole.htm

HSW.sm.loadPageInfo(6914); OAS_AD('TopBanner'); HowStuffWorks Search HowStuffWorks and the web Video Podcasts Blogs Quizzes Games RSS Adventure Animals Auto Culture ... Next Page How Black Holes Work by Craig Freudenrich, Ph.D. Print Cite Feedback ... Recommend Cite This! Close Please copy/paste the following text to properly cite this HowStuffWorks article: Inside this Article Introduction to How Black Holes Work What is a Black Hole? Types of Black Holes How We Detect Black Holes ... See all Astronomy Terms articles The Space Shuttle Videos Black Hole Image Gallery Photo courtesy NASA/Space Telescope Science Institute (J. Gitlin, artist) Artist concept of the near vicinity of the black hole at the core of galaxy NGC 4261. See more black hole images You may have heard someone say, "My desk has become a black hole!" You may have seen an astronomy program on television or read a magazine article on black holes. These exotic objects have captured our imagination ever since they were predicted by Einstein's Theory of General Relativity in 1915.

67. Black Holes Simple explanation of black holes in the framework of the history of the Universe http://www.historyoftheuniverse.com/blakhole.html

Physical Environment Loading Basic Information Further Information Other Hotu Pages Earlier 11 Billion Years ago ... Later This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. Our new free weekly podcast Time Crystal tells this story as sci-fi fantasy A small region of space which contains so much matter and has such a strong gravitational field that nothing, not even light , can escape. The region therefore looks dark, hence the name. There are thought to be three kinds of black hole: Supermassive black holes These lie at the centre of quasars and certain active galactic nuclei that appear to be exploding. Millions or billions of stars together with gas dust and perhaps planets can fall into the black hole and give off enormous amounts of energy. In 1994 the Hubble Space Telescope provided conclusive evidence for the existence of a supermassive black hole at the centre of the M87 galaxy. It has a mass equal to two to three billion stars but is only as big as the solar system Stellar black holes These form at the end of the life of a red giant star more than three times as large as the Sun. Stars with a less mass evolve into

68. Falling Into A Black Hole Fall into a black hole on a real free fall orbit. All distortions of images are real, both general relativistic from the gravitational bending of light, and special relativistic from the near light speed orbit. http://casa.colorado.edu/~ajsh/schw.shtml

Check out the new (2010) website Falling Into a Black Hole In which we fall into a black hole on a real free fall orbit. All distortions of images are real, both general relativistic from the gravitational bending of light, and special relativistic from the near light speed orbit. The black hole belongs to a quadruple stellar system, a binary binary. The system is fictional, but plausible. After you are done dying at the central singularity of the black hole, feel free to explore more about the Schwarzschild geometry, about wormholes, about the collapse of a black hole, and about Hawking radiation. . These pages last modified 19 Apr 2001. The URL of this site is http://casa.colorado.edu/~ajsh/schw.shtml Here's the Movie Index . For what's see site history Movie preview Approaching the black hole (89K GIF movie) Firing a probe while orbiting the black hole (95K GIF movie) Falling to the singularity (217K GIF movie) Clicking on the text link gives you the movie in normal size. Clicking on the image gives you a double-size version of the same movie (same resolution, same number of K, just twice as big on the screen). For explanations of these movies, and more, advance

69. Black Holes - NASA Science Don't let the name fool you a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area think of a star ten times more http://science.nasa.gov/astrophysics/focus-areas/black-holes/

Skip to Main Content Header Visit NASA.gov Connect ... Site Map Search Site Go! Home Big Questions Earth Heliophysics ... Focus Areas → Black Holes Black Holes Don't let the name fool you: a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area - think of a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City. The result is a gravitational field so strong that nothing, not even light, can escape. In recent years, NASA instruments have painted a new picture of these strange objects that are, to many, the most fascinating objects in space. Universe Black Holes-1 Spitzer. This star-studded infrared image from NASA's Spitzer Space Telescope shows the Milky Way's churning center. In this false-color image, old, cool stars appear blue, and the dust near hot, massive stars is red. Astronomers believe there is a supermassive black hole in the galaxy's core, visible here as a bright white spot. Credit: NASA/JPL-Caltech/S. Stolovy (SSC/Caltech). Although the term was not coined until 1967 by Princeton physicist John Wheeler, the idea of an object in space so massive and dense that light could not escape it has been around for centuries. Most famously, black holes were predicted by Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all other forces and produces a black hole.

70. Black Holes - Free Online Games (FOG) Can you get to the end without being sucked in a black hole? Try this cool puzzle game! http://black-holes.freeonlinegames.com/

71. Activity: Exploring Black Holes - StarDate's Black Hole Encyclopedia Activity Exploring Black Holes . What is a black hole? How do astronomers find them? What's an event horizon? Take your students on a quest for these answers in a new set of http://blackholes.stardate.org/resources/activities/

Contact StarDate About StarDate Friends of McDonald Sign up for SkyTips ... Resources Activity: Exploring Black Holes What is a black hole? How do astronomers find them? What's an event horizon? Take your students on a quest for these answers in a new set of activities. Students use this site, as well as real and current data on supermassive black holes as they work through these activities. Download the PowerPoint presentation and four movie files to reinforce your instruction. Grade level: Integrated Physics and Chemistry, Physics, Astronomy Activity File (8.1 MB pdf) Science Standards (61 Kb pdf) Additional Downloads Student Journal (76 Kb pdf) News Flashes (44 Kb pdf) Black Hole Claims (68 Kb pdf) (136 Kb pdf) Please download the PowerPoint and four movie files. Make sure that all these files are in the same directory (or folder) on your computer hard drive.

72. (S-7a)   The Black Hole At The Center Of Our Galaxy About the 2004 discovery that the center of our galaxy holds a black hole 3.7 million times heavier than the Sun http://www.phy6.org/stargaze/Sblkhole.htm

Site Map Glossary Timeline Central Home Page (S-7a) The Black Hole at the Center of our Galaxy Index S-4. Colors of Sunlight S-4A.Color Expts. Optional: Quantum Physics Q1.Quantum Physics Q2. Atoms (and 6 more) S-6.The X-ray Sun S-7.The Sun's Energy S-7A. The Black Hole at our Galactic Center ... S-9.Nuclear Weapons Our Sun is part of a huge wheel-shaped collection of stars. On a dark night they form a glowing band across the sky"The Milky Way" to ancient Greek observers, and to us, our galaxy. When you look at any part of that glow, you are looking through the wheel edge-on, and what you actually see is the light of many, many distant stars, whose light blends to a glow. What holds the wheel together? Astronomers are still not sure (see further below), but have long suspected that a very massive black hole existed at the center of our galaxy, created early in the history of the universe. Their suspicion focused on a compact radio source, also found to emit x-rays, hidden behind dust clouds in the constellation of Sagittarius, the archer. Now we know more.

73. Professional Advise On International Legal, Policy And Political Aspects Of Oute Welcome to the website of Black Holes! Welcome to the website of Black Holes B.V., the consultancy company of Frans von der Dunk! The name of the company was inspired by a http://www.black-holes.eu/

Welcome to the website of Black Holes! Welcome to the website of Black Holes B.V., the consultancy company of Frans von der Dunk! The name of the company was inspired by a lyric from the song Shine On You Crazy Diamond of the rock band Pink Floyd, and is further clarified in the mission statement Black Holes B.V. was established in 2007 in order to accommodate the growing need for professional advice on international legal, policy and political aspects of outer space activities and their applications here down on Earth in the broadest sense of the word. The added-value which Black Holes can bring to your professional activities lies in its comprehensive, interdisciplinary approach as reflected in the services it offers in a wide range of areas of expertise career , or visit the gallery Black Holes B.V. is headquartered in the beautiful and age-old University-town of Leiden, The Netherlands. For contact details, click here

74. ASP: Black Holes To Blackboards: God Divided By Zero Laying your hands on a black hole is hard (and dangerous) to do, but there are ways to understand these objects and avoid the pain of dimension-bending. http://www.astrosociety.org/pubs/mercury/9802/lockwood.html

home publications SEARCH ASP SITE: Match ALL words Match ANY word Publications Topics: Books ASP Conference Series Monograph Publications IAU Publications Books of Note ... Purchase through the AstroShop Journals Publications of the ASP (PASP) Magazines Mercury Magazine Archive Guidelines for Authors Order Mercury Issues ... Mercury Advertising Rates Newletters The Universe in the Classroom ASP E-mail Newsletters Special Features Astronomy Beat Contact Us Black Holes to Blackboards: God Divided by Zero Mercury, March/April 1998 Table of Contents Jeffrey F. Lockwood Sahuaro High School Laying your hands on a black hole is hard (and dangerous) to do, but there are ways to understand these objects and avoid the pain of dimension-bending. A couple of weeks ago, I was sitting in the second-floor bathroom at Steward Observatory, not thinking at all about astronomy or writing columns. On the stall door in front of me, written perhaps by a clever astronomy student, was an equation in bold black ink: BLACK HOLES = GOD/0. As I pondered the philosophical significance of the equation, I realized that I have never tried to bring black holes to blackboards as my column title states. One of the most esoteric and fascinating objects for students to ponder, a black hole comes with virtually no lab activities. How do you lay your hands on a black hole and survive?

75. Black Holes Black Holes and Neutron Stars offers a nontechnical discussion about black holes and neutron stars. Topics include what they are, how they form, and how we detect them. There http://www.eclipse.net/~cmmiller/BH/blkbh.html

Black Holes INTRODUCTION BLACK HOLES NEUTRON STARS AND PULSARS HOW THEY FORM HOW WE DETECT THEM BIBLIOGRAPHY ... BOOKS Once a giant star dies and a black hole has formed, all its mass is squeezed into a single point. At this point, both space and time stop. It's very hard for us to imagine a place where mass has no volume and time does not pass, but that's what it is like at the center of a black hole. The point at the center of a black hole is called a singularity . Within a certain distance of the singularity, the gravitational pull is so strong that nothingnot even lightcan escape. That distance is called the event horizon . The event horizon is not a physical boundary but the point-of-no-return for anything that crosses it. When people talk about the size of a black hole, they are referring to the size of the event horizon. The more mass the singularity has, the larger the event horizon. The structure of a black hole is something like this: Many people think that nothing can escape the intense gravity of black holes. If that were true, the whole Universe would get sucked up. Only when something (including light) gets within a certain distance from the black hole, will it not be able to escape. But farther away, things do not get sucked in. Stars and planets at a safe distance will circle around the black hole, much like the motion of the planets around the Sun. The gravitational force on stars and planets orbiting a black hole is the same as when the black hole was a star because gravity depends on how much mass there isthe black hole has the same mass as the star, it's just compressed.

76. Black Holes - Celestial Objects On Sea And Sky Black holes are arguably the strangest and most mysterious objects in the universe. The bizarre properties of black holes can challenge the laws of physics and even the very http://www.seasky.org/celestial-objects/black-holes.html

Enter your search terms Submit search form Web www.seasky.org 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 Enter your search terms Submit search form Web www.seasky.org

77. BLACK HOLE LINKS A set of links to numerous black holes resources on the Web, this site is a useful starting point for finding technical articles on the topic. http://web.mit.edu/afs/athena.mit.edu/user/r/e/redingtn/www/netadv/bh.html

The Net Advance of Physics: BLACK HOLES As Astronomical Objects or In Field Theory Part One: ASTRONOMICAL BLACK HOLES General Observations (?) of Black Holes Evaporation Thermodynamics ... BLACK HOLES IN FIELD THEORY GENERAL: Overviews: Elementary: Black Holes FAQ, by Ted Bunn Black Hole and Neutron Star (Simulation), by Robert J. Nemiroff Black Hole Evaporation (elementary explanation), by E. M. Francis, 95/08 Spacetime Wrinkles, from the NCSA Expo Advanced: Lectures on Black Holes, by Andy Strominger, 95/01 The Net Advance of Physics: GENERAL RELATIVITY Event Horizons: Numerical Methods: Numerical Relativity and Black Hole Horizons, by J. Masso, 94/12 /Interactions and Dynamics of Black Holes: Accelerating Black Holes: Quantum Aspects of Gravity: ACCELERATING BLACK HOLES, by Steve Giddings Part 1, 95/07 Accretion Disks: The Physics of Black Hole X-Ray Transients, by J. C. Wheeler et al., 96/01 Merger Rate Estimates: Cosmological Models of Gamma-Ray Bursts, by C. D. Dermer and T. J. Weiler, 95/08 OBSERVATIONS(?) OF BLACK HOLES: Black Holes Within Galaxies: Milky Way: What is Sgr A*?, by Heino Falcke, 94/11

78. [gr-qc/9805066] Gravitational Collapse, Black Holes And Naked Singularities Review article by T. P. Singh (Tata Institute) about gravitational collapse and the cosmic censorship hypothesis; includes a summary description of known models of collapse resulting in the formation of black holes and naked singularities. http://arxiv.org/abs/gr-qc/9805066

arXiv.org gr-qc Search or Article-id Help Advanced search All papers Titles Authors Abstracts Full text Help pages Full-text links: Download: PDF PostScript Other formats Current browse context: gr-qc new recent SLAC-SPIRES HEP refers to ... what is this? Bookmark what is this? General Relativity and Quantum Cosmology Title: Gravitational Collapse, Black Holes and Naked Singularities Authors: T. P. Singh (Submitted on 18 May 1998) Abstract: This article gives an elementary review of gravitational collapse and the cosmic censorship hypothesis. Known models of collapse resulting in the formation of black holes and naked singularities are summarized. These models, when taken together, suggest that the censorship hypothesis may not hold in classical general relativity. The nature of the quantum processes that take place near a naked singularity, and their possible implication for observations, is briefly discussed. Comments: 17 pages, Latex File. Based on a talk given at the Discussion Workshop on Black Holes, Bangalore, 9-12 Dec. 1997, to appear in the Conference Proceedings Subjects: General Relativity and Quantum Cosmology (gr-qc) ; Astrophysics (astro-ph); High Energy Physics - Theory (hep-th) Journal reference: J.Astrophys.Astron.20:221,1999

79. Modern Research By Eduard Westra Presentation about stellar black holes, suitable for undergraduate students. Created by Eduard Westra for a second-year astronomy course he was taking at the Australian National University. http://www.mso.anu.edu.au/~westra/aoz/

80. [gr-qc/0107034] Black Holes And String Theory Review by Rob Myers (Perimeter Institute); includes information about calculations of the black hole entropy using branes. Based on lectures given at the 4th Mexican School on Gravitation and Mathematical Physics. http://arxiv.org/abs/gr-qc/0107034

arXiv.org gr-qc Search or Article-id Help Advanced search All papers Titles Authors Abstracts Full text Help pages Full-text links: Download: PDF PostScript Other formats Current browse context: gr-qc new recent SLAC-SPIRES HEP refers to ... NASA ADS Bookmark what is this? General Relativity and Quantum Cosmology Title: Black Holes and String Theory Authors: Robert C. Myers (Submitted on 10 Jul 2001) Abstract: This is a short summary of my lectures given at the Fourth Mexican School on Gravitation and Mathematical Physics. These lectures gave a brief introduction to black holes in string theory, in which I primarily focussed on describing some of the recent calculations of black hole entropy using the statistical mechanics of D-brane states. The following overview will also provide the interested students with an introduction to the relevant literature. Comments: LaTex, lectures given at the 4th Mexican School on Gravitation and Mathematical Physics Subjects: General Relativity and Quantum Cosmology (gr-qc) Journal reference: Rev.Mex.Fis. 49S1 (2003) 14-18

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