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DARK MATTER

DARK MATTER. A Presentation by: Amanda Bentley-De Sousa, Jessica Chang and Rebecca Martinho. What is Dark Matter?.

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DARK MATTER

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  1. DARK MATTER A Presentation by: Amanda Bentley-De Sousa, Jessica Chang and Rebecca Martinho

  2. What is Dark Matter? Dark matter is stable new particles with weak interactions and masses. These particles are leftover from the Big Bang. Dark matter is invisible because there is no light or heat emitted and interacts with matter only gravitationally. Dark matter makes up approximately 80-90% of the universe. The two main categories that scientists consider for dark matter are: MACHOs and WIMPs.

  3. A History of Dark Matter -In 1933, Fritz Zwicky was studying the motions of distant galaxies. -In 1951, Vera Rubin noticed that galaxies didn’t rotate as they should, therefore there must be some kind of matter affecting the motions of galaxies.

  4. Determining & Detecting the Mass of Galaxies The Doppler Shift: a method used to detect the motions of galaxies. Rotational Velocity: the fact that galaxies rotate. Seeing the Light: observing the amount of light emitted. 3D Mapping & The Hubble Space Telescope X-Rays: At high temperatures, gases emit X Rays

  5. MACHOs Massive Astronomical Compact Halo Objects MACHOs are big, strong, dark matter made up of ordinary matter called baryonic matter (matter made up of protons, neutrons, and electrons that don’t emit radiation that we can detect on Earth).

  6. WIMPs Weakly Interacting Massive Particles WIMPs are little weak subatomic dark matter made up of non-ordinary matter called non-baryonic matter. Hot dark matter: lightweight particles moving at almost the speed of light Cold dark matter: large particles that are very slow moving While astronomers search for MACHOs, particle physicists search for WIMPs.

  7. Bullet Cluster Bullet Cluster is the term that refers to 2 colliding clusters of galaxies and was discovered in 2006 as a way to study and observe particles interacting. Experiments revealed that luminous matter interacts and that certain matter didn’t, providing the most evidence that dark matter really exists.

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