Galaxy Groups and Clusters

Most galaxies exist in groups. Some groups are small, like our own Local Group, with three large galaxies and around two dozen tiny ones. Other groups are huge like the Virgo Cluster with 1300 confirmed members. Galaxies are farther organized into superclusters with vast stretches of empty space in between. The reason for this organization is not understood.




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Stephan's Quintet
Stephan's Quintet
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Credit: NASA/ESA/Hubble SM4 ERO Team
Perseus Cluster
Perseus Cluster
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Credit: <a href='http://www.cxielo.ch/gallery/main.php'>Cxielo Astrophotos</a>
Two Spirals and a Dwarf
Two Spirals and a Dwarf
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Credit: NASA/ESA/M. Livio (STScI)/Hubble Heritage Team (STScI/AURA)
Markarian's Chain
Markarian's Chain
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Credit: <a href='http://www.wpshetgooi.nl/lynn_van_rooijen1.htm'>Lynn van Rooijen</a>
Gravitational Lensing
Gravitational Lensing
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Credit: Andrew Fruchter (STScI) et al./WFPC2/HST/NASA
Ten Thousand Galaxies
Ten Thousand Galaxies
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Credit: NASA/ESA/S. Beckwith (STScI)/HUDF Team


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