Investigating Dark Matter And Dark Energy
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Investigating Dark Matter And Dark Energy

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Investigating Dark Matter And Dark Energy Investigating Dark Matter And Dark Energy Presentation Transcript

  •  
    • Dark matter and dark energy make up about 95% of our universe
      • 70% is dark energy
      • 25% is dark matter
      • 5% is normal, visible matter
    • Know more about what it isn't than what it is
      • Not readily visible
      • It's dark
        • Meaning that it's not visible like stars and planets
        • It doesn't reflect or emit electromagnetic radiation
      • Can only be detected indirectly
      • May consist of…
        • Dust
        • Planets
        • Black holes
        • Dwarf stars
        • Clouds of gas that don’t light up
    • 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
    • More is unknown than known
    • We know how much dark energy there is because we know how it affects the Universe's expansion
    • People were sure that gravity was going to slow the expansion of the universe
    • 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
      • People came up with 3 theories
        • Result of a long-discarded version of Einstein's theory of gravity
        • There was some strange kind of energy-fluid that filled space
        • There is something wrong with Einstein's theory of gravity
          • Scientists still don't know which theory is correct, but they named the solution dark energy
    • Dark energy proves that the universe will keep expanding
    • Scientists have more to learn about dark matter and dark energy, which will keep them studying for years
  •  
    • &quot;Dark Energy, Dark Matter — NASA Science.&quot; NASA Science . N.p., n.d. Web. 27 Jan. 2010. < http://nasascience.nasa.gov/astrophysics/what-is-dark-energy >.
    • &quot;dark matter — Infoplease.com.&quot; Infoplease: Encyclopedia, Almanac, Atlas, Biographies, Dictionary, Thesaurus. Free online reference, research & homework help. — Infoplease.com . N.p., n.d. Web. 25 Jan. 2010. < http://www.infoplease.com/ce6/sci/A0814671.html >.
    • &quot;dark matter: meaning and definitions — Infoplease.com.&quot; Dictionary Search Page — Infoplease.com . N.p., n.d. Web. 25 Jan. 2010. < http://dictionary.infoplease.com/dark-matter >.
    • &quot;Dark matter.&quot; Science Daily: News & Articles in Science, Health, Environment & Technology . N.p., n.d. Web. 27 Jan. 2010. < http://www.sciencedaily.com/articles/d/dark_matter.htm >.
    • Farndon, John. From Ptolemy's Spheres to Dark Energy: Discovering the Universe (Chain Reactions) . Chicago: Heinemann, 2007. Print.
    • &quot;Invisible universe: interview with George Smoot - | unesco.org.&quot; UNESCO . N.p., n.d. Web. 29 Jan. 2010. < http://portal.unesco.org/en/ev.php-URL_ID=46036&URL_DO=DO_TOPIC&URL_SECTION=201.html >.
    • Sparrow, Giles. Observing the Universe (Secrets of the Universe) . Milwaukee: World Almanac Library, 2006. Print.