From super to ultra: Just how big can black holes get?
A new analysis suggests that at least 10 black holes in a sample of 18
galaxy clusters weigh between 10 and 40 billion times the mass of the
Sun. Learn more »
X-ray: NASA/CXC/Stanford/J. Hlavacek-Larrondo, et al.; Optical: NASA/STScI; Radio: NSF/NRAO/VLA