Fraser Cain
Globular clusters are ancient relics of the early Universe, perhaps all that remain from the dwarf galaxies that were torn apart by the Milky Way. They can be 12-13 billion years old, containing 1-2 million stars with several hundred thousand times the mass of the Sun. A new paper shows that globular clusters contain two distinct populations of stars: the primordial ones with normal chemical composition and a second with unusual amounts of heavier elements.
http://www.inaf.it/en/inaf-news/3dview-galactic-globular-clusters
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