Conversation

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