SNC1DW 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.

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  2. Galaxy
    A huge collection of stars, planets, dust, and gas held together by gravity.

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  3. Star Cluster
    A collection of stars held by gravity.

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  4. Open Cluster
    A collection of 50 to 1000 stars. They appear along the main band of the Milky Way.

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  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

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  6. Local Group
    The small group of galaxies that include the Milky Way.

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  7. Supercluster
    A massive cluster of 4 to 25 clusters of galaxies, hundreds of millions of light-years in size.

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  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.

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  9. Cosmology
    The study of the universe. Cosmologists try to answer questions about the universe.

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  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.

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  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.

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  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.

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

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

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  15. Radiation
    Electromagnetic waves travelling through matter.

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

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  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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Card Set
SNC1DW Chapter 9
Glossary terms for chapter 9.
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