Merging galaxies can contain multiple active supermassive black holes

Japanese astronomers have learned that merging galaxies can contain at least a pair of active and luminous supermassive black holes. Typically, only one of the two black holes are activated like this, leading the astronomers to speculate that something unique is happening in the environment to get them going. » 1/29/14 9:00am 1/29/14 9:00am