SNC1DW Chapter 9

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Author:
Jaimin_Jethva
ID:
265219
Filename:
SNC1DW Chapter 9
Updated:
2014-03-05 19:02:04
Tags:
space science galaxy doppler BigBang
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Description:
Glossary terms for chapter 9.
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  1. Milky Way
    The galaxy 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 a million 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 include 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
    Can 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 the 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. Redshift
    The effect where an object is moving away from an observer has it's wavelengths lengthened, towards the red end of the spectrum.

  12. Blueshift
    The effect where an object is moving away from an observer has it's wavelengths shortened, towards the blue end of the spectrum.

  13. Big Bang
    The event which may have caused the universe to start expanding 14 billion years ago.

  14. Cosmic Microwave Background
    The radiation left over from the big bang which fills the universe.

  15. Radiation
    Electromagnetic waves travelling through matter.

  16. Dark matter
    The most abundant from of matter in the universe. Invisible to telescopes and makes up 23% of the universe.

  17. Dark energy
    A from 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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