M13: The Densest Star Cluster You Can See from Earth

M13 is a globular cluster with stars packed just 0.1 light-years apart.
Located in the Hercules constellation, it's over 11 billion years old.
Discover why astronomers call it a "cosmic time capsule."

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Image credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona
License: Creative Commons Attribution-ShareAlike 3.0 (CC BY-SA 3.0)
Source: http://www.caelumobservatory.com/gallery/m13.shtml

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