You remember the iconic picture of a black hole from the @ehtelescope? Now there are three - a mini-movie so to speak. The structure of magnetic fields changes, the brightness wobbles, but the ring remains rock solid. That seals the case for it being a black hole and we are learning the astrophysics near the event horizon.

https://eventhorizontelescope.org/new-eht-images-reveal-unexpected-polarization-flips-at-m87

Proud our group @Radboud_uni made significant contributions via Michael Janssen and two ERC Synergy grants that I co-led.
#astrodon #astronomy