Space- Chapter 9

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  1. Milky Way
    The galaxy that includes the solar system appears as a hazy white band in the night sky
  2. Galaxy
    A huge collection of stars, planets, gas, dust that is held together by gravity
  3. Star cluster
    A collection of stars held together by gravity
  4. Open cluster
    A collection of 50 to 100 stars. Open stars appear on the main band if the milky way
  5. Globular cluster
    A collection if 100,000 to a million stars that is arranged in a spherical shape. Globular cluster are found along the Milky Way
  6. Local group
    The small group of about 40 galaxies that includes the Milky Way
  7. Superclusters
    A gigantic cluster of 4 to 25 clusters of galaxies that is hundreds of millions if light years away
  8. Cosmology
    The study if the universe
  9. Doppler effect
    The change in pitch of a sound due to the motion of the source relative to an observer. The change in frequency of light source due to its motion relative to an observer
  10. Redshift
    The effect in which objects moving away from an observer have theirs wavelengths lengthened towards the red end of the spectrum
  11. Blueshift
    The effect in which objects are moving towards an observer. Have their wavelengths shortened, towards the blue end of the spectrum
  12. Big Bang
    The event that may have caused the expansion of the universe 14 billion years ago
  13. Cosmic microwave background (CMB)
    The radiation left over from the Big Bang, which fills the universe
  14. Dark matter
    The most abundant form of matter in the universe, invisible to telescopes
  15. Dark energy
    A form if energy that makes up nearly three quarters of the universe, has the effect of increasing the expansion of the universe
  16. Spiral galaxy
    When viewed from above it looks like a pinwheel
  17. Elliptical galaxies
    Range in shape from a perfect sphere to a stretched up ellipse
  18. Irregular galaxies
    They don't have a regular shape
  19. Radiation
    the process in which energy is emitted as particles or waves.
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Space- Chapter 9
2014-03-04 20:47:01
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