Space Chapter 9

  1. Milky Way
    The galaxy that includes the solar system; appears as hazy white band in the night sky
  2. Galaxy
    a huge collection of stars, planets, gas, and dust, held together by gravity
  3. Star cluster
    a collection of stars held together by gravity
  4. Open cluster
    a collection of 50-1000 star; open clusters appear along the main band of the Milky Way
  5. Globular cluster
    A collection of 100 000 to a million stars that is arranged in a distinct spherical shape, globular clusters are around the center of the Milky Way
  6. Local group
    The small group of about 40 galaxies that includes the Milky Way
  7. Supercluster
    a gigantic cluster of 4 to 25 clusters of galaxZies that is hundreds of millions of light-years in size
  8. Shapes of galaxies
    • Spiral
    • a type of galaxy that looks like a pinwheel when viewed from above and has a bulge when looking on it's side

    • Elliptical
    • A type of galaxy that ranges in shape from a perfect sphere to a stretched out ellipse. They contain some of the oldest stars in the universe 

    • Irregular
    • A galaxy that has an irregular shape and can be made up of old and new stars.
  9. Cosmology
    The study of the universe
  10. Doppler effect
    The change in pitch due to the motion of the source relative to an observer. It is also the change in frequency of a light source due to it's motion relative to an observer
  11. Redshift
    The effect in which objects moving away from an observer have their wavelengths lengthened, toward the red end if the visible spectrum
  12. Blueshift
    The effect in which objects moving toward an observer have their wavelengths shortened
  13. Big bang
    The event that may have triggered the expansion of the universe 14 years
  14. Cosmic microwave background (CMB)
    The radiation left over from the big bang, which fills the universe
  15. radiation
  16. Dark matter
    The most abundant form of energy in the universe, is not visible to telescope
  17. Dark energy
    A form of energy that makes nearly three quarters of the universe (73%); has the effect of increasing the expansion of the universe
Author
HuckKim
ID
314268
Card Set
Space Chapter 9
Description
Ms. Day's Gr.9 space science class
Updated