What happens at the center of a black hole?

Black Holes

Sagittarius A*: The Milky Way's supermassive black hole

Black Hole Hunters Cast Gaze At Center Of The Milky Way Galaxy

Supermassive black hole - Wikipedia

There must be a singularity at each black hole's center - Big Think

Trolling the Monster in the Heart of the Milky Way - The New York

Earth is 2,000 light years closer to supermassive black hole at the center of our galaxy than we thought

Black Hole at Heart of Our Galaxy Is on Crash Course, Space-Time

Bizarre behavior shown by two giant black holes

What happens at the center of a black hole?

Black holes could be dark stars with 'Planck hearts

What would happen if you fell into a black hole?

Was Our Universe Formed Inside the Quantum Chaos of Another