Big Bang

Why does time only ever move in one direction? We talk to philosophers of physics Jeremy Butterfield and David Wallace, as well as the eminent Roger Penrose about the puzzle time poses to physicists and what it has to do with the Big Bang and the second law of thermodynamics.

Did the Big Bang mark the beginning of time? Not if we live in a bubble multiverse!

Find out what gravitational waves will tell us about the Universe: from understanding its birth to figuring out whether black holes have hairs.

Find out about the heroic effort that led to the detection of gravitational waves and the excitement of their discovery.

What do we know about our Universe? And could there be more than one?

Bob Wald tells us why probabilities are important in cosmology.

The Astronomer Royal examines the evolution of our Universe and the important role of the constants of nature in this filmed public talk.

Cosmologists gathered in the Netherlands last week to discuss a new view of the Universe. The Universe as seen by Planck was an international conference to discuss the recently released scientific results from the Planck satellite, including two particularly striking snapshots of the early Universe.

This podcast comes to you from a conference on the nature of time. We talk to philosophers of physics Jeremy Butterfield and David Wallace, as well as the eminent Roger Penrose about the puzzle time poses to physicists and what it has to do with the Big Bang and the second law of thermodynamics.

What's the mysterious stuff that makes up 70% of our Universe?