## black hole

Is the Universe finite or infinite? Is there infinity inside a black hole? Is space infinitely divisible or is there a shortest length? We talk to philosophers and physicists to find out.

The newly observed ripple in spacetime will help us unlock some of the secrets of the Universe.

Astronomers have explained a strange effect observed in the vicinity of black holes.

Find out how some black holes are bigger on the inside than they are on the outside.

Physicists have finally detected the gravitational waves they have been chasing for nearly 100 years.

It's impossible not to be fascinated by black holes. Find out all you'd like to know about them with these articles, videos and podcasts.

Rumours abound that physicists have detected gravitational waves produced by the merger of two black holes.

A hundred years ago, on 25 November 1915, Einstein first presented his general theory of relativity. We explore this famous theory and what it says about the world we live in.

Pau Figueras explains how Einstein's theories predicted the existence of black holes, and how to describe them mathematically.