On the fourteenth day of advent, we consider the night sky...which isn't actually black, but permeated by the faint afterglow of the Big Bang.

There are some interesting answers to this question, including that we live in a bubble multiverse!

On the ninth day of advent we find out about the maths of black holes.

Behind door #8 we answer all the questions you've ever wanted to ask about the physical reality of black holes!

On the fourth day of advent, we remember one of our most exciting cosmological events, watching the announcement of the detection of gravitational waves in 2016.

On this, the third day of advent, we explore some strange consequences of general relativity on our concept of time.

Open door #1 and scroll through our changing understanding of gravity...

We're proud to announce the launch of a documentary we have been working on together with the Discovery Channel and the Stephen Hawking Centre for Theoretical Cosmology in Cambridge.

Nothing, not even light, can escape from a black hole. Or can it? Find out about one of Stephen Hawking's most radical results.

What is dark energy and how do we know it's there?

Physicists believe that around 82% of all the matter in the Universe is invisible dark matter. But if it's invisible how do they know it's there?