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Milky Way
The galaxy that includes the solar system appears as a hazy white band in the night sky
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Galaxy
A huge collection of stars, planets, gas, 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 to 100 stars. Open stars appear on the main band if the milky way
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Globular cluster
A collection if 100,000 to a million stars that is arranged in a spherical shape. Globular cluster are found along the Milky Way
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Local group
The small group of about 40 galaxies that includes the Milky Way
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Superclusters
A gigantic cluster of 4 to 25 clusters of galaxies that is hundreds of millions if light years away
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Cosmology
The study if the universe
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Doppler effect
The change in pitch of a sound due to the motion of the source relative to an observer. The change in frequency of light source due to its motion relative to an observer
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Redshift
The effect in which objects moving away from an observer have theirs wavelengths lengthened towards the red end of the spectrum
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Blueshift
The effect in which objects are moving towards an observer. Have their wavelengths shortened, towards the blue end of the spectrum
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Big Bang
The event that may have caused the expansion of the universe 14 billion years ago
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Cosmic microwave background (CMB)
The radiation left over from the Big Bang, which fills the universe
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Dark matter
The most abundant form of matter in the universe, invisible to telescopes
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Dark energy
A form if energy that makes up nearly three quarters of the universe, has the effect of increasing the expansion of the universe
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Spiral galaxy
When viewed from above it looks like a pinwheel
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Elliptical galaxies
Range in shape from a perfect sphere to a stretched up ellipse
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Irregular galaxies
They don't have a regular shape
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Radiation
the process in which energy is emitted as particles or waves.
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