 It is estimated to be 12.5-billion years old.It had been thought that NGC 2808, like typical globular clusters, contains only one generation of stars formed simultaneously from the same material.In 2007, a team of astronomers led by Giampaolo Piotto of the University of Padua in Italy investigated Hubble Space Telescope images of NGC 2808 taken in 2005 and 2006 with Hubble's Advanced Camera for Surveys.