Dark Matter And Energy


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Dark Matter And Energy

  1. 1. Dark Matter and Energy By Ben T.
  2. 2. Dark Energy <ul><li>More is known about it than what is actually known. </li></ul><ul><li>The universe is decided to be 70% dark energy, 25% dark matter, less than 5% normal matter. </li></ul><ul><li>Scientist are blaming dark energy for the expansion of the universe. </li></ul>
  3. 3. Explanations for Dark Energy <ul><li>It’s a property of space. </li></ul><ul><li>Empty space can posses it’s own energy. </li></ul><ul><li>Quantum theory of matter- &quot;empty space&quot; is actually full of temporary (&quot;virtual&quot;) particles that continually form and then disappear. </li></ul><ul><li>It’s a new type of dynamical energy, possibly a fluid or field that has the opposite effect on universe expansion than normal matter and energy. </li></ul><ul><li>Einstein’s theory of gravity is not correct. </li></ul>
  4. 4. What Needs to be Done <ul><li>In order to make a decision between all of the different possibilities is simply more data and better data. There is a mission in the planning stages that will provide Universe observations for theorists to discriminate between the theories with. Until then the mystery remains. </li></ul>
  5. 5. Visual The image above shows how the universe has expanded over time. Scientists have theorized that the accelerated expansion is due to a mysterious dark energy
  6. 6. Dark Matter <ul><li>We are more sure what it’s not that what it is. </li></ul><ul><li>Its not, </li></ul><ul><ul><li>In the forms of stars and planets that we see. </li></ul></ul><ul><ul><li>Dark clouds of normal matter. </li></ul></ul><ul><ul><li>Antimatter because antimatter gives up gamma rays and we don’t see that with the dark matter. </li></ul></ul><ul><ul><li>Incredibly large black holes. </li></ul></ul>
  7. 7. It might be… <ul><li>There are a few possibilities left . </li></ul><ul><li>It could still be baryonic matter if it were to be tied up in brown dwarfs or in small highly dense bits of heavy elements. </li></ul><ul><li>The most plausible possibility however is that it is not baryonic but rather made up of more exotic particles such as axions or WIMPS. (Weakly Interacting Massive Particles) </li></ul>
  8. 8. New Breakthrough <ul><li>The Hubble Space Telescope and Chandra X-ray observatory have captured observations of powerful collisions of galaxy clusters. The observations seem to indicate that a titanic collision has separated dark from ordinary matter. This seems to be similar to the Bullet Cluster showing that the Bullet Cluster is not a unique case. </li></ul>
  9. 10. Bibliography <ul><li>above, scientists have come up with the composition that we described, ~70% dark energy, ~25% dark matter, and ~5% normal matter. What is dark matter?. &quot;Dark Energy, Dark Matter — NASA Science.&quot; NASA Science . N.p., n.d. Web. 12 Jan. 2010. < http://nasascience.nasa.gov/astrophysics/what-is-dark-energy >. </li></ul>