At long last, on April 10, 2019, scientists revealed the first-ever picture of a black hole's event horizon. On April 10, 2019, the Event Horizon Telescope collaboration released the first successful image of a black hole's event horizon. Prior to the Event Horizon Telescope's first image, we had a number of different ways of measuring the masses of black holes. Instrumentation improvements to the Event Horizon Telescope will reveal the presence of additional black holes near galactic centers. Similarly, when an object orbits a black hole, it also exerts a gravitational pull on the black hole itself.

Source: Forbes April 11, 2019 06:00 UTC