Astronomers make rare discovery that could help explain Milky Way formation

The Terzan 5 cluster could shed light on how the Milky Way was formed after an Italian-led team of astronomers found it contained two very different types of stars; some very young and some very old. The 7 billion year age gap between the two different types of stars suggests that star formation in Terzan 5 was not continuous but happened in two very distinct bursts. Sep 7, 2016