Science- Chapter 9

  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, and 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 star. Open clusters appear along the main band of the Milky Way
  5. Globular cluster
    A cluster of 100,000 to a million star that is arranged in a distinctive spherical shape. Globular clusters are clustered around 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 galaxies that is hundreds of millions of light years in size
  8. Cosmology
    The study of the universe
  9. Doppler effect
    The change of pitch and sound due to the motion of the source relative to an observer. The change of frequency of a light source due to its motion relative to an observer
  10. Redshift
    The effect in which objects moving away from an observer have their wavelengths lengthened, towards the red end of the spectrum
  11. Blueshifted
    The effect in which objects are moving towa
Card Set
Science- Chapter 9
Science chapter 9 flash cards