Dark Energy And Dark Matter


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Dark Energy And Dark Matter

  1. 1. Allie Hohmann
  2. 2. <ul><li>In the 1998 and the Hubble Space Telescope (HST) observations of very distant supernovae that showed that, a long time ago, the universe was actually expanding more slowly than it is today </li></ul><ul><li>The expansion of the universe has not been slowing due to gravity, as everyone thought, it has been accelerating </li></ul>
  3. 3. <ul><li>Scientists came up with three explanations </li></ul><ul><ul><li>It was a result of a long-discarded version of Einstein's theory of gravity, one that contained what was called a &quot;cosmological constant.&quot; </li></ul></ul><ul><ul><li>There is something wrong with Einstein's theory of gravity and a new theory could include some kind of field that creates this cosmic acceleration </li></ul></ul><ul><ul><li>Still don't know what the correct explanation is, but gave it the name &quot;dark energy“ </li></ul></ul><ul><ul><li>Roughly 70% of the universe is dark energy </li></ul></ul>
  4. 4. <ul><li>Its presence is indicated by unexplained gravitational effects on stars and galaxies </li></ul><ul><li>Much more certain of what dark matter is not than what it is </li></ul><ul><li>Doesn't emit, reflect, or absorb light. In fact, dark matter does not seem to be composed of the familiar electrons, neutrons, and protons </li></ul><ul><li>Some of the dark matter is composed of black holes </li></ul>
  5. 5. <ul><li>Astronomers know dark matter is there by its gravitational effect on the matter that we see, and there are ideas about the kinds of particles it must be made of </li></ul><ul><li>Dark matter does not reveal its presence by emitting any type of electromagnetic radiation. It emits no infrared radiation, nor does it give off radio waves, ultraviolet radiation, X-rays or gamma rays </li></ul>
  6. 6. <ul><li>The best estimates of the total mass of everything that we can see with out telescopes is roughly 0.01 M. </li></ul><ul><li>The other 99% of the stuff in the universe is dark matter </li></ul>
  7. 7. <ul><li>&quot;2009 April 02 « Ghost Radio.&quot; Ghost Radio . N.p., n.d. Web. 26 Jan. 2010. < http://ghostradio.wordpress.com/2009/04/02/ >. </li></ul><ul><li>&quot;Dark Energy, Dark Matter - NASA Science.&quot; NASA Science. N.p., n.d. Web. 20 Jan. 2010. < http://nasascience.nasa.gov/astrophysics/what-is-dark-energy >. </li></ul><ul><li>&quot;Dark matter detailed.&quot; The Why Files | The Science Behind the News. N.p., n.d. Web. 20 Jan. 2010. < http://whyfiles.org/092x_ray/4.html >. </li></ul><ul><li>&quot;Dark Matter.&quot; The Creation Research Society . N.p., n.d. Web. 26 Jan. 2010. < http://www.creationresearch.org/ </li></ul><ul><li>&quot; File:080998 Universe Content 240.jpg - Wikipedia, the free encyclopedia.&quot; Wikipedia, the free encyclopedia . N.p., n.d. Web. 26 Jan. 2010. < http://en.wikipedia.org/wiki/File:080998_Universe_Content_240.jpg >. </li></ul>
  8. 8. <ul><li>Farndon, John. From Ptolemy's Spheres to Dark Energy: Discovering the Universe (Chain Reactions) . Chicago: Heinemann, 2007. Print. </li></ul><ul><li>&quot;Is dark matter theory or fact? : Scientific American.&quot; Science News, Articles and Information | Scientific American . N.p., n.d. Web. 26 Jan. 2010. < http://www.scientificamerican.com/article.cfm?id=is-dark-matter-theory-or >. </li></ul><ul><li>Sparrow, Giles. Observing the Universe . london: world almanac library, 2006. Print. </li></ul><ul><li>they, we know how long ago. &quot;Dark Energy - Introduction.&quot; Imagine The Universe! Home Page. N.p., n.d. Web. 20 Jan. 2010. < http://imagine.gsfc.nasa.gov/docs/science/mysteries_l1/dark_energy.html >. </li></ul><ul><li>&quot;What is Dark Matter?.&quot; XS4ALL - internet, bellen en hosting. N.p., n.d. Web. 20 Jan. 2010. < http://www.xs4all.nl/~johanw/PhysFAQ/Relativity/GR/dark_matter.html >. </li></ul>