The flashcards below were created by user
NelsH
on FreezingBlue Flashcards.
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Milky Way
The galaxy of our solar system is in. Appears as a hazy white band in the night sky.
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Galaxy
A huge collection of stars, planets, dust, and gas held together by gravity
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Star Cluster
A collection of stars held by gravity
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Open cluster
A collection of 50 to 1000 stars. They appear along the main band of the milky way
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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.
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Local group
The small group of galaxies that includes the Milky Way
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Supercluster
A massive cluster of 4 to 25 clusters of galaxies, hundreds of millions of light-years in size.
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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.
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Cosmology
The study of the universe. Cosmologists try to answer questions about universe.
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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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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.
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Blue shift
The effect where an object is moving towards an observer has its wavelengths shortened, towards the blue end of the spectrum.
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Big bang theory
The event which may have caused the universe to start expanding 14 billion years ago.
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Cosmic microwave background radiation (CMB)
The radiation left over from the big bang which fills the universe
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Radiation
Electromagnetic waves traveling through matter.
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Dark matter
The most abundant form of matter in the universe. Invisible to telescopes and makes up 23% of the universe.
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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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