The image is thought to establish that black holes really do exist; they are not just astrophysicists’ imaginings.
The black holes has a mass “6.5 billion times that of the Sun:”
This now-iconic image shows the doughnut-shaped ring of radio emissions surrounding a supermassive black hole that lies at the centre of a galaxy 55 million light-years from Earth. Event Horizon Telescope astronomers are the first to obtained images of the region near the event horizon of a black hole – the point beyond which matter and energy cannot escape the object’s intense gravity. This was done by combining the outputs of eight radio dishes in six different locations across the globe, which itself is an engineering triumph.
Hamish Johnston, “https://physicsworld.com/a/first-direct-observation-of-a-black-hole-and-its-shadow-is-physics-world-2019-breakthrough-of-the-year/” at PhysicsWorld
More on the black hole.