Hubble Uncovers Largest Known Population of Star Clusters

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Ten years ago, astronomer John Blakeslee spotted dots of light peppered
throughout images of a giant cluster of galaxies, called Abell 1689. Each dot was
not one star, but hundreds of thousands of stars crowded together in groupings
called globular clusters. Blakeslee counted 500 such clusters, the brightest
members of a teeming population of globular clusters.

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