Image from the Event Horizon Telescope
From the story on the PhysicsWorld (physicsworld.com) website,
”The hefty black hole within the heart of our galaxy – known as Sagittarius A* or Sgr A* – lies some 27,000 light-years away from Earth and had been scrutinized, albeit indirectly, by astronomers for decades. Based on the motions of stars zipping around a seemingly empty spot at the Milky Way’s centre, they had deduced that a body roughly four million times the mass of our Sun must reside there.”