Black Holes


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Black Holes

  1. 1. Lian A. Black Holes
  2. 2. What are they? <ul><li>A simple definition would be: a region in space that has a gravitational force so powerful, not even light can escape </li></ul><ul><li>They are basically are areas in space where because the gravitational pull is very forceful, nothing can escape </li></ul>
  3. 3. How do they form? <ul><li>Black holes form when a massive star dies </li></ul><ul><li>A star is gigantic fusion reactor, that is fueled by gases </li></ul><ul><li>Eventually the gases will be used up and the star will die, creating a supernova </li></ul><ul><li>The remains of a supernova form a black hole </li></ul>
  4. 4. How do we know black holes actually exist? <ul><li>The prediction of how black holes existing was originally brought up by Einstein's theories and calculations </li></ul><ul><li>The Hubble Space Telescope showed data that there was mass at an area of space where they appeared to be nothing </li></ul><ul><li>Scientists studied the data and concluded that the “invisible” mass in space had to be a black hole, formed from a collapsed star </li></ul>
  5. 5. How big are they? <ul><li>The size of a typical black hole would be 10,000,000,000,000,000,000,000,000,000,000 kg! (31 zeros) </li></ul><ul><li>This number is estimated by finding the mass of an average star, larger than the sun, and multiplying it by ten because the black holes are extremely dense </li></ul><ul><li>A black hole with the mass of planet Earth would only have a 2-centimeter diameter </li></ul>
  6. 6. Some Definitions: <ul><li>Line of singularity-the collapsed center of the black hole </li></ul><ul><li>Event Horizon-the opening to the black hole </li></ul><ul><li>Ergoshpere-the egg shaped area surrounding the black hole; the egg shape is caused by the strong gravitational pull </li></ul><ul><li>Static Limit-the region between ergosphere and normal space—the area that is not effected by the black hole’s gravitational pull </li></ul>
  7. 7. Schwarzschild Black Holes: <ul><ul><li>A black hole that does not rotate </li></ul></ul><ul><ul><li>This type of black hole only has a line of singularity and an event horizon </li></ul></ul><ul><ul><li>A black hole that rotates (it rotates because the star that created it rotated) </li></ul></ul><ul><ul><li>This is the most common type of black hole </li></ul></ul><ul><ul><li>Kerr black holes have all of the following: a line of singularity, an event horizon, an ergosphere, and a static limit </li></ul></ul>Kerr Black Holes:
  8. 8. Kerr
  9. 9. Schwarzschild
  10. 10. Bibliography-Websites <ul><li>&quot;Glossary.&quot; Chandra :: Resources . N.p., n.d. Web. 12 Jan. 2010. < </li></ul><ul><li>Freudenrich, Craig, and Ph.D.. &quot;HowStuffWorks &quot;How Black Holes Work&quot;.&quot; Howstuffworks &quot;Science&quot; . N.p., n.d. Web. 12 Jan. 2010. <>. </li></ul><ul><li>Freudenrich, Craig, and Ph.D.. &quot;HowStuffWorks &quot;How Stars Work&quot;.&quot; Howstuffworks &quot;Science&quot; . N.p., n.d. Web. 12 Jan. 2010. < </li></ul><ul><li>&quot;BLACK HOLESby Ted Bunn.&quot; Berkeley Cosmology Group . N.p., n.d. Web. 12 Jan. 2010. < </li></ul><ul><li>&quot;How Big is the Sun?.&quot; Universe Today . N.p., n.d. Web. 12 Jan. 2010. <>. </li></ul><ul><li>Freudenrich, Craig, and Ph.D.. &quot;HowStuffWorks &quot;How Black Holes Work&quot;.&quot; Howstuffworks &quot;Science&quot; . N.p., n.d. Web. 12 Jan. 2010. <>. </li></ul>
  11. 11. Bibliography-Books <ul><li>Holt, Rinehart, and Winston. &quot;Stars, Galaxies, and the Universe.&quot; Holt Science And Technology: Astronomy Short Course J . Student ed. Austin: Holt Rinehart & Winston, 2007. 45. Print. </li></ul><ul><li>Burns, Charles. Black Hole . New York: Pantheon, 2008. Print. </li></ul><ul><li>Tyson, Neil Degrasse. Death by Black Hole: And Other Cosmic Quandaries . New York: W. W. Norton, 2007. Print. </li></ul>