Duration: 02:33

James May tells the story of the Bohr-Einstein debates and the history of quantum physics.

Duration: 02:51

An explanation of how 'dark matter' provides the extra gravity needed to hold the outer stars of distant galaxies in place.

Duration: 07:08

Professor Brian Cox discusses Albert Einstein's theory of space-time and examines the astronomical evidence for it.

Duration: 02:43

Outlines a theory of star formation, suggesting stars are formed by collapsing clouds of hydrogen at very low temperatures.

Duration: 05:36

Professor Stephen Hawking has revealed he has a bet that the Large Hadron Collider at CERN will not find the Higgs boson - the most highly sought-after particle in physics.

Duration: 02:48

Stephen Hawking talks about his famous equation that explains the complex behaviour of entropy in black holes.

Duration: 04:30

Brian Cox explains why some stars look red and how this help prove that the universe is expanding?

Duration: 04:50

An introduction to how the colours of the stars determine how hot they are and how long they will live.

Duration: 02:14

The Large Hadron Collider experienced faults and had to be shut down one week after it was switched on in September 2008. An early warning system has been recommended to prevent a recurrence.

Duration: 05:16

Brian Cox explains the concept of entropy and the arrow of time.

Duration: 04:20

Marcus Du Sautoy explains to Alan Davies how some mathematicians visualise a potential shape for the universe.

Duration: 04:45

Professor Max Tegmark uses a waterfall to explain the properties of a black hole and what would happen if a person fell into one.

Duration: 05:01

Where is the edge of space? Historical and scientific reasons are given to explain why a precise distance has not been identified.