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Investigating Dark Matter And Dark Energy


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Investigating Dark Matter And Dark Energy

  1. 2. <ul><li>Dark matter and dark energy make up about 95% of our universe </li></ul><ul><ul><li>70% is dark energy </li></ul></ul><ul><ul><li>25% is dark matter </li></ul></ul><ul><ul><li>5% is normal, visible matter </li></ul></ul>
  2. 3. <ul><li>Know more about what it isn't than what it is </li></ul><ul><ul><li>Not readily visible </li></ul></ul><ul><ul><li>It's dark </li></ul></ul><ul><ul><ul><li>Meaning that it's not visible like stars and planets </li></ul></ul></ul><ul><ul><ul><li>It doesn't reflect or emit electromagnetic radiation </li></ul></ul></ul><ul><ul><li>Can only be detected indirectly </li></ul></ul><ul><ul><li>May consist of… </li></ul></ul><ul><ul><ul><li>Dust </li></ul></ul></ul><ul><ul><ul><li>Planets </li></ul></ul></ul><ul><ul><ul><li>Black holes </li></ul></ul></ul><ul><ul><ul><li>Dwarf stars </li></ul></ul></ul><ul><ul><ul><li>Clouds of gas that don’t light up </li></ul></ul></ul>
  3. 4. <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>
  4. 5. <ul><li>More is unknown than known </li></ul><ul><li>We know how much dark energy there is because we know how it affects the Universe's expansion </li></ul><ul><li>People were sure that gravity was going to slow the expansion of the universe </li></ul>
  5. 6. <ul><li>In 1998, the Hubble Space Telescope came along and observed distant supernovae that showed that the universe was expanding slower than it is now a long time ago </li></ul><ul><ul><li>People came up with 3 theories </li></ul></ul><ul><ul><ul><li>Result of a long-discarded version of Einstein's theory of gravity </li></ul></ul></ul><ul><ul><ul><li>There was some strange kind of energy-fluid that filled space </li></ul></ul></ul><ul><ul><ul><li>There is something wrong with Einstein's theory of gravity </li></ul></ul></ul><ul><ul><ul><ul><li>Scientists still don't know which theory is correct, but they named the solution dark energy </li></ul></ul></ul></ul>
  6. 7. <ul><li>Dark energy proves that the universe will keep expanding </li></ul><ul><li>Scientists have more to learn about dark matter and dark energy, which will keep them studying for years </li></ul>
  7. 9. <ul><li>&quot;Dark Energy, Dark Matter — NASA Science.&quot; NASA Science . N.p., n.d. Web. 27 Jan. 2010. < >. </li></ul><ul><li>&quot;dark matter —; Infoplease: Encyclopedia, Almanac, Atlas, Biographies, Dictionary, Thesaurus. Free online reference, research & homework help. — . N.p., n.d. Web. 25 Jan. 2010. < >. </li></ul><ul><li>&quot;dark matter: meaning and definitions —; Dictionary Search Page — . N.p., n.d. Web. 25 Jan. 2010. < >. </li></ul><ul><li>&quot;Dark matter.&quot; Science Daily: News & Articles in Science, Health, Environment & Technology . N.p., n.d. Web. 27 Jan. 2010. < >. </li></ul><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;Invisible universe: interview with George Smoot - |; UNESCO . N.p., n.d. Web. 29 Jan. 2010. < >. </li></ul><ul><li>Sparrow, Giles. Observing the Universe (Secrets of the Universe) . Milwaukee: World Almanac Library, 2006. Print. </li></ul>