Space.com: "Incredible Technology: How to See a Black Hole"

"Black holes are essentially invisible, but astronomers are developing technology to image the immediate surroundings of these enigmas like never before. Within a few years, experts say, scientists may have the first-ever picture of the environment around a black hole, and could even spot the theorized "shadow" of a black hole itself."

"Incredible Technology: How to See a Black Hole" by Clara Moskowitz for Space.com