Science Glossary Terms Chapter 9

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Science Glossary Terms Chapter 9
2014-03-05 23:30:56
Glossary Terms

Chapter 9 Glossary Terms
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  1. Milky Way:
    Is a galaxy that contains our solar system and is a spiral system. 

  2. Galaxy:
    Is a collection of billions of stars, gas and dust held together by gravity. A galaxy isn't a consistent size and shape.
  3. Star Clusters:
    • Are groups of stars that are held together by gravity and travel together, they range from 10 - a million stars.
  4. Open Clusters:
    Are a collection of 50 - 1000 stars and they appear along the main bend of the Milky Way.
  5. Globular Clusters:
    Are a collection of 100 000 - a million stars arranged in a spherical shape, and appear around the centre of the Milky Way.
  6. Local Group:
    Is a group of 40 galaxies including the Milky Way, and the diameter is about 10 million light years.
  7. Super Cluster:
    A gigantic cluster of 4 - 25 galaxies which is hundreds of millions of light years on size.
  8. Shapes of Galaxies:
    • 1) Spiral Galaxies: Disk shaped with dusty, curvy turns
    • 2) Irregular Galaxies: Are unusually shaped
  9. Cosmology:
    Is the study of the universe.
  10. Doppler Effect:
    Is a phenomenon where spectral lines are slightly displaced from their normal position.
  11. Redshift:
    Is when the wavelength of light from an object is moving away from an observer is lengthened toward the red end of the visible spectrum.
  12. Blueshift:
    Is when the wavelength of light from an object is moving towards the observer is shortened toward the blue end of the visible spectrum.
  13. Big Bang Theory:
    Is a prediction that the universe was extremely compact, small and unimaginably dense.
  14. Cosmic Microwave Background (CMB)
    Is radiation left over from the Big Bang, the temperature of the CMB was -210 degrees celsius
  15. Radiation:
    Is a process where electromagnetic waves travel through a vacuum.
  16. Dark Matter:
    Is the missing mass from galaxies, it's one of the most abundant form of matter in the universe.
  17. Dark Energy:
    Is the accelerating of the universe outwards even though it should be shrinking.