The 1st Milky Way black hole image was groundbreaking — the next could be even better 

 By demonstrating the ability for joint observations at the short radio wavelength of 0.87mm, the Event Horizon Telescope has improved its observational acuity by half. 

https://cdn.mos.cms.futurecdn.net/yMquMe4srNd7YKaBJUmqw6.png

https://www.space.com/event-horizon-black-hole-image-tests