English industrialist stole iron technique from Black metallurgists

Astronomers witness energetic switch on of black hole

Gravitational lensing has been used for the first time to detect and measure an inactive black hole. The door is now open to study the largest black holes in the universe. "Gravitational lensing events are rare, but are most prevalent in the most massive galaxies, that host the largest black holes."

Using a detector the size of a galaxy, astronomers find strongest evidence yet for gravitational waves from supermassive black hole pairs