Black Holes
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Black Holes






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    Black Holes Black Holes Presentation Transcript

    • Black Holes
      Eric B
    • About Black Holes
      A region of space that is a result of a giant star collapsing
      It has extreme gravity
      If someone were to watch something fall into a black hole, they would never see it go past the event horizon, because the light coming off the object would get sucked in before it would reach the eyes of the person watching. The only time someone could see something fall in is at the same time the black hole evaporates
      According to Einstein, not only can light fall in but space itself
    • Center of the Milky Way
      A celestial object known as Sagittarius A* lies at the center
      This is thought to be a supermassive black hole
      About 2,500,000 times the mass of the sun and 6,700,000,000 km. across, possibly as large as the entire solar system
      It is about 26,000 light-years away from earth
    • Parts of a Black Hole
      Outer event horizon
      Space-time- the fabric of both space and time
      Inner event horizon
      “White hole”
    • Outer Event Horizon
      Outer event horizon- the point of no return.
      As one nears the outer event horizon, it appears time slows down and stops altogether.
      The gravity a black hole has is enough to “spaghettify” something- tear it in half and in half again until there are only atoms left.
      Protects the singularity
    • Inner Event Horizon
      Appears if the black hole has a small charge to it
      The point where the drop into a black hole is straight in
      Appears only if the black hole is spinning
      Objects start to travel at the speed of light after they reach the inner event horizon
    • Singularity
      An infinitely dense and small point in space covered by the event horizons
      If the black hole is charged enough and the magnitude is greater than it’s mass, the event horizons disappear and leave behind a “naked” singularity.
      Where spacetime
      The singularity doesn’t obey the laws of physics
      In a static black hole, or a black hole that isn’t spinning, the singularity cannot be avoided, but in a charged, or spinning , black hole, the singularity forms a ring and any objects that then go into a black hole will not be destroyed by the singularity.
    • White Hole
      More science fiction than science fact, a white hole is the opposite of a black hole
      Spews matter out at the speed of light that the black hole sucked in
      The only flaw in this is that the ejected matter would collect and would collapse upon itself, forming a black hole
    • Bibliography
      Clark, Stuart . Galaxy: Exploring the Milky Way. China: Fall River Press, 2008. Print.
      Shiga, David. " Student Research Center - powered by EBSCOhost: Event horizon revealed by Milky Way vanishing act." EBSCOhost. N.p., n.d. Web. 1 Feb. 2010. <>.
    • Bibliography
      "Gothos: Jillian's Guide to Black Holes." Gothos: Land of Physics and Fantasy. N.p., n.d. Web. 30 Jan. 2010.
      "Black Holes." Chris Mihos - Webhome. N.p., n.d. Web. 30 Jan. 2010.
      "BLACK HOLES by Ted Bunn."Berkeley Cosmology Group. N.p., n.d. Web. 30 Jan. 2010.
      "WikiAnswers - What is the inner event horizon in a black hole." WikiAnswers - The Q&A wiki. N.p., n.d. Web. 31 Jan. 2010.