Transcript Black Holes
Black Holes Fred Ikeler Shimon Masaki Danny Okano Black Holes The intense gravitational field left when a giant star collapses It is called a black hole because not even light can escape Photon Sphere The outer edge where light bends but is still escapable Event Horizon The point at which no light can escape Singularity The shrunken star too small to be measured but with indefinite density How A Black Hole is Formed Black holes are thought to form from stars or other massive objects if and when they collapse from their own gravity to form an object whose density is infinite: in other words, a singularity. During most of a star's lifetime, nuclear fusion in the core generates electromagnetic radiation, including photons, the particles of light. This radiation exerts an outward pressure that exactly balances the inward pull of gravity caused by the star's mass. QuickTime™ and a decompressor are needed to see this picture. Why does the Star Collapse? As the nuclear fuel is exhausted, the outward forces of radiation diminish, allowing the gravitation to compress the star inward. The contraction of the core causes its temperature to rise and allows remaining nuclear material to be used as fuel. The star is saved from further collapse -- but only for a while. QuickTime™ and a decompressor are needed to see this picture. Video Black Hole Video How Do Scientists Find Black Holes? A black hole cannot be viewed directly because light cannot escape it. Effects on the matter that surrounds it infer its presence. Matter swirling around a black hole heats up and emits radiation that can be detected. QuickTime™ and a decompressor are needed to see this picture. Who discovered black holes? Karl Schwarzschild is credited with being the brilliant astronomer who developed the concept of black holes. In 1916, using Einstein's general theory of relativity, he began to make calculations about the gravity fields of stars. He concluded that if a huge mass, such as a star, were to be concentrated down to the size of an infintessimal point, the effects of Einstein's relativity would get really fairly extreme. Hubble Telescope Shots QuickTime™ and a decompressor are needed to see this picture. Death by Black Hole Although nobody knows for sure, it has been theorized that the human body would be ripped/ shredded into the size of atoms. Another theory is that your body would be stretched and compressed at the speed of light Wrap Up Black Holes are created when a large star collapses on itself. At the event horizon of a Black hole, not even light can escape. There are 3 parts to a black hole, Photon sphere, Event horizon, and singularity. Death by Black Hole probably hurts Karl Schwarschild discovered black holes Black holes cannot be seen, however scientists can find them due to their immense gravitational pull on matter around them. Work Cited Daniels, Brett. "Black Holes!" HEASARC: IMPORTANT MESSAGE. 11 Feb. 2006. Web. 11 Jan. 2011. <http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_hol es.html>. Holla, Jack. "Black Hole." Wikipedia, the Free Encyclopedia. 04 Aug. 2007. Web. 11 Jan. 2011. <http://en.wikipedia.org/wiki/Black_hole>. Markine, Chris. "No Escape: The Truth about Black Holes." Amazing Space. 11 Oct. 2005. Web. 11 Jan. 2011. <http://amazingspace.stsci.edu/resources/explorations/blackholes/lesson/index. html>. McGee, Mark. "ScienceDaily: Black Hole News." Science Daily: News & Articles in Science, Health, Environment & Technology. 20 June 2008. Web. 11 Jan. 2011. <http://www.sciencedaily.com/news/space_time/black_holes/>.