Because it is above the atmosphere, the Hubble Space Telescope can detect these small dead stars in nearby old star clusters called globular clusters. (astronomynotes.com)
This would be fine, were it not for the fact that studies of globular clusters of stars suggests they are about 15 billion years old. (newscientist.com)
Craig Wheeler of the University of Texas in Austin, US, who is not a member of the team, says it is still not known whether middleweight black holes form in globular clusters in the first place. (newscientist.com)