Andrew Fabian

Radio waves passing through magnetized gas have their polarization slightly rotated, like a compass needle deflecting near a magnet. This rotation, called the Faraday effect, revealed the invisible environment around the supermassive black hole in galaxy NGC 1275.

A lighthouse that changes the color of each flash in time with its rotation: that's one way to describe what astronomers saw when they pointed the latest X-ray telescope, XRISM, at the pulsar Hercules X-1. This object is a neutron star pulling matter from a companion ordinary star.