Science Chapter 9

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  1. Milky Way
    The galaxy of our solar system is in. Appears as a hazy white band in the night sky.
  2. Galaxy
    A huge collection of stars, planets, dust, and gas held together by gravity
  3. Star Cluster
    A collection of stars held by gravity
  4. Open cluster
    A collection of 50 to 1000 stars. They appear along the main band of the milky way
  5. Globular Cluster
    A collection of 100 000 to 1 000 000 stars. Arranged in a distinct spherical shape and appear around the centre of the milky way.
  6. Local group
    The small group of galaxies that includes the Milky Way
  7. Supercluster
    A massive cluster of 4 to 25 clusters of galaxies, hundreds of millions of light-years in size.
  8. Shapes of galaxies
    Be Spiral, elliptical, or irregular. Spiral galaxies look like a pinwheel/whirlpool. Elliptical galaxies can be perfectly spherical to the shape of a football, and irregular galaxies have no common shape.
  9. Cosmology
    The study of the universe. Cosmologists try to answer questions about universe.
  10. Doppler effect
    The change in frequency of a light source's motion relative to the Observer, or the change in the pitch of sound relative to the Observer.
  11. Red shift
    The effect where an object is moving away from an Observer has it's wavelengths lengthened, towards the red end of the spectrum.
  12. Blue shift
    The effect where an object is moving towards an observer has its wavelengths shortened, towards the blue end of the spectrum.
  13. Big bang theory
    The event which may have caused the universe to start expanding 14 billion years ago.
  14. Cosmic microwave background radiation (CMB)
    The radiation left over from the big bang which fills the universe
  15. Radiation
    Electromagnetic waves traveling through matter.
  16. Dark matter
    The most abundant form of matter in the universe. Invisible to telescopes and makes up 23% of the universe.
  17. Dark energy
    A form of energy that takes up about 73% of the universe, and has the effect of increasing the expansion of the universe.
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Science Chapter 9
2015-01-23 19:51:08
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SNC1DW space chapter 9
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