NASA’s Hubble Space Telescope has uncovered what astronomers are reporting as the dimmest stars ever seen in any globular star cluster. Globular clusters are spherical concentrations of hundreds of thousands of stars. Seeing the whole range of stars in this area will yield insights into the age, origin, and evolution of the cluster.
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http://www.esa.int/esaSC/SEMT24Z7QQE_index_0.html