Why the very first image of a black hole is an event

The international network of radio telescopes EHT will present Wednesday, April 10 the first photo of a supermassive black hole in the center of our galaxy.
We may soon be able to observe the invisible. On Wednesday, 10 April, starting at 3 pm (CET), the international Event Horizon Telescope (EHT) radio network is scheduled to hold a simultaneous press conference in six countries to provide the first evidence by observing the existence of black holes. These massive and voracious galactic monsters are at the heart of many scientific theories since the eighteenth century but they have never been directly observed.

The image of a black hole captured by the Event Horizon Telescope. Photograph: EHT Collaboration

From Stephen Hawking to Christopher Nolan, black holes have always fascinated as they represent the ultimate unknown. These celestial objects have an extremely large mass in a very small volume. They are so massive that nothing escapes either matter or light. And as nothing can escape, they are invisible. Researchers must be content to try to grasp their contours, indirect proofs of their existence.

In April 2017, eight telescopes spread across the globe simultaneously targeted two black holes with the goal of obtaining an image. One, Sagittarius A * is located in the center of the Milky Way, 26,000 light years from Earth. The other is one of the most massive known black holes, 6 billion times more than our Sun and 1,500 times more than Sgr A *. It is located 50 million light-years from Earth, in the heart of the M87 galaxy.

Read More: The first-ever picture of a black hole is revealed!