Key points are not available for this paper at this time.
The next-generation Event Horizon Telescope (ngEHT) will be a transformative upgrade to the Event Horizon Telescope (EHT), capable of making real-time and time-lapse movies of supermassive black holes on event horizon scales. These movies will resolve complex structure and dynamics in the immediate vicinity of the event horizon, bringing into focus not just the persistent strong-field gravity features predicted by General Relativity (GR), but details of active accretion and relativistic jet-launching that drive large scale structure in the Universe. This effort builds upon recent results by the EHT: the first image of M87's supermassive black hole and its magnetic field structure, as well as resolved images of Sgr A*, the central black hole at the heart of the Milky Way.
Pesce et al. (Wed,) studied this question.