The flashcards below were created by user
Mitra
on FreezingBlue Flashcards.
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Milky Way
The galaxy that includes our solar system; appears as a hazy white band in the night sky.
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Galaxy
A huge collection of stars, planets, gas and dust that is held together by gravity.
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Star Cluster
A collection of stars held together by gravity.
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Open Cluster
A collection of 50-1000 stars, they appear along the main band of the Milky Way.
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Globular Cluster
A collection of 100 000 to a million stars, arranged in a distinctive spherical shape, they appear around the center of the Milky Way.
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Local Group
The small group of around 40 galaxies that includes the Milky Way.
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Cosmology
The study of the Universe.
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Doppler Effect
The change in frequency of a light source due to its motion relative to an observer; also, the change in pitch of a sound due to the motion of the source relative to an observer.
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Redshift
The effect in which objects moving away from an observer have their wavelengths lengthened toward the red end of the visible spectrum.
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Blueshift
The effect in which objects moving towards an observer have their wavelengths shortened, toward the blue end of the visible spectrum.
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Big bang
Th event that may have triggered the expansion of the universe 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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