Black Holes Fred Ikeler Shimon Masaki Danny Okano

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Black HolesFred IkelerShimon MasakiDanny Okano
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Black Holes

• The intense gravitational field left when a giant
  star collapses

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• It is called a black hole because not even light
  can escape

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Photon Sphere

• The outer edge where light bends but is still
  escapable

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Event Horizon

• The point at which no light can escape

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Singularity

• The shrunken star too small to be measured but
  with indefinite density

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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.

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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.

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Video

• Black Hole Video

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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.

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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.

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Hubble Telescope Shots
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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

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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.

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Work Cited

• Daniels, Brett. "Black Holes!" HEASARC IMPORTANT
  MESSAGE. 11 Feb. 2006. Web. 11 Jan. 2011.
  lthttp//imagine.gsfc.nasa.gov/docs/science/know_l2
  /black_holes.htmlgt.
• Holla, Jack. "Black Hole." Wikipedia, the Free
  Encyclopedia. 04 Aug. 2007. Web. 11 Jan. 2011.
  lthttp//en.wikipedia.org/wiki/Black_holegt.
• Markine, Chris. "No Escape The Truth about Black
  Holes." Amazing Space. 11 Oct. 2005. Web. 11 Jan.
  2011. lthttp//amazing-space.stsci.edu/resources/ex
  plorations/blackholes/lesson/index.htmlgt.
• McGee, Mark. "ScienceDaily Black Hole News."
  Science Daily News Articles in Science,
  Health, Environment Technology. 20 June 2008.
  Web. 11 Jan. 2011. lthttp//www.sciencedaily.com/ne
  ws/space_time/black_holes/gt.