quantumaniac:Galaxy Cluster vs. Galaxy Group When dealing with enormous objects like galaxies - it
quantumaniac: Galaxy Cluster vs. Galaxy Group When dealing with enormous objects like galaxies - it seems that any collection of them is a tremendous being. However, there are two different types of a galactic collection - galaxy clusters and groups. Upon first glance, it’s easy to believe that these terms could be used interchangeably - but there is a difference! A galaxy group is the smallest collection galaxies - there are typically no more than 40, and the diameter of the system is about 1-2 Mpc (1023 m). On the other hand, galaxy clusters are much larger - containing anywhere from 50-1000 galaxies and are significantly larger than groups, having a diameter of about 2-10 Mpc (1024 m). Our own galaxy, the Milky Way, is a part of the a galaxy group called Local Group (shown above in the picture). The Milky Way and the Andromeda Galaxy are the two most massive of the group, and are both spiral galaxies. Other members include the Large Magellanic Cloud, Small Magellanic Cloud, Canis Major Dwarf, Ursa Minor Dwarf, Leo I, and Ursa Major I Dwarf. -- source link
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