S. P. O'Sullivan

Two giant galaxy clusters, Abell 3391 and Abell 3395, are slowly colliding in the southern sky. Between them stretches a bridge of scorching gas, like a mist over a river, linking two banks. Astronomers have long wanted to know whether this "intergalactic bridge" hosts a magnetic field and how it behaves. The field cannot be seen directly, but its trace can be caught.

At the center of many galaxies lurks a supermassive black hole, ejecting relativistic plasma jets over hundreds of kiloparsecs. One such is the radio galaxy ESO 137-G007 in the Norma Cluster, known as the “Corkscrew Galaxy” for its twisted jets.