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The Milky Way's ancient heart

(ESO) Ancient stars, of a type known as RR Lyrae, have been discovered in the center of the Milky Way for the first time, using ESO's infrared VISTA telescope. RR Lyrae stars typically reside in ancient stellar populations over 10 billion years old. Their discovery suggests that the bulging center of the Milky Way likely grew through the merging of primordial star clusters.
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