November 23, 2009
For such a cluster to form, huge amounts of interstellar material must compress into a tiny volume very quickly.
Old globular clusters, such as those living in the halo of the Milky Way, certainly host stellar-mass black holes. However, such black holes are the products of stellar evolution within their clusters and do not influence their clusters' formation.
Globular cluster M80, like other globulars, likely formed from condensing clouds of interstellar material.
Photo by The Hubble Heritage Team (AURA/STScI/NASA)
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