Spectacular Star Cluster Reveals Elusive Black Holes --"Hidden Inside a 12-Billion-Year Old Globular Cluster" (VIDEO)

Astronomers at the Harvard-Smithsonian Center for Astrophysics say they have evidence for the existence of a medium-sized black hole with a mass of about 2,200 suns at the heart of 47 Tucanae, a 12-billion-year-old ball of of thousands of stars...