Supermassive black holes (SMBHs) are the churning engines of galaxies, but astrophysicists aren’t exactly sure how two of them merge. While evidence suggests this occurs, we’ve never seen a merger ...

Astronomers working with decades of radio telescope data have identified what they describe as the first close pair of ...

The original version of this story appeared in Quanta Magazine. Galaxies have been merging into ever-bigger structures over the course of cosmic history. When galaxies merge, the supermassive black ...