Black hole A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing not even particles and electromagnetic radiation such as light can escape from inside it The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole The boundary of the region from which no escape is possible is called the event horizon. HubbleSite Black Holes Gravity s Relentless Pull Black Holes Gravity s Relentless Pull Information, virtual journeys, and simulations about black holes from the Space Telescope Science Institute Black Holes Science Mission Directorate 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. Black Holes Discovery, Facts and Theories Space Black holes are some of the strangest and most mysterious objects in the universe Billions of them may exist in the Milky Way alone But what, exactly, is a black hole HubbleSite Black Holes Gravity s Relentless Pull Black holes are places where ordinary gravity has become so extreme that it overwhelms all other forces in the Universe Once inside, nothing can escape a black hole s gravity not even light. StarDate s Black Hole Encyclopedia The latest black hole A solid overview of black holes and details on the best known individual black holes for the general public StarDate s Black Holes Encyclopedia is an extension of the research and public outreach efforts of Karl Gebhardt, a University of Texas astronomer, and StarDate Online. Black Holes Science NetLinks Purpose To introduce black holes and demonstrate how space telescopes can provide data to support current hypotheses Context In this activity, students will explore a Web resource called No Escape The Truth About Black Holes on the Amazing Space website This is a module that introduces students to the science of black holes. How Does a Black Hole Form livescience Black holes form through the collapse of a very massive star, but many mysteries remain about these puzzling stellar objects. black holes Astronomy RECENT POSTS Brian May and David Eicher to give talks in London, Bath, and Amsterdam Starmus Festival s star studded lineup for announced The Tucson Star Party will be a day of Sun and stars What Is a Black Hole NASA Black holes may answer questions about the beginning and the future of the universe.