On NPR's 13.7 blog, Adam Frank, an astrophysics professor and an author, and Charles Gammie, a member of the EHT collaboration, discuss how close we are to obtaining images of black holes: Are We About To See A Black Hole?
In a recent blog post within the series entitled "Taking the First Picture of a Black Hole", the ESO outreach team explains some technological challenges that the Event Horizon Telescope collaboration faces in pursuit of high-resolution images of black holes using the technique of very long baseline interferometry: Challenges in Obtaining an Image of a Supermassive Black Hole
"After completing five nights of observations, today astronomers may finally have captured the first-ever image of the famous gravitational sinkhole known as a black hole. [...]
As the final observing run ended at 11:22 a.m. ET, team member Vincent Fish sat contentedly in his office at the MIT Haystack Observatory in Westford, Massachusetts. For the past week, Fish had been on call 24/7, sleeping fitfully with his cell phone next to him, the ringer set loud."
"Soon ALMA will take on perhaps the most ambitious endeavor of its brief existence. Over 10 days in early April, it will join radio telescopes at five other sites spanning the globe, from Hawaii to the South Pole, in an attempt to capture the shadow of a supermassive black hole that sits at the heart of our Milky Way galaxy, and an even bigger one in the neighboring galaxy M87."
"...[A]n ambitious radio astronomy project now aims at taking the first snapshot of an actual black hole. In other words, a real-life picture of Interstellar’s black hole Gargantua, if a highly pixelated one."