A Greek researcher of the Diaspora Dimitris Psaltis, professor of astronomy and physics at Arizona University, played a key role in the new Event Horizon Telescope (EHT) that took the first picture of a black hole [19659002] The monstrous black hole in Messier The 87 galaxy has a diameter of about 40 billion kilometers (three million times greater than the Earth) and is located at a distance of 500 million trillion kilometers