Carlos Frenk talks to Jim Al-Khalili about dark matter and modelling the cosmos.
Melvyn Bragg and his guests discuss dark matter, the 'missing mass' of the universe.
Sue Nelson joins scientists down a mine on their search for the elusive dark matter.
Ben Miller looks at dark matter, the strange invisible material that fills the universe.
Brian Cox and Robin Ince head to Mosi in Manchester and look at the invisible universe.
Heather Couper looks at the search for dark matter. What we see is only a fraction of it.
The most common particle in the universe continuously passes through each of us.
Melvyn Bragg and guests discuss the neutrino, the so-called 'ghost particle'.
Brian Cox and Robin Ince return to discuss the next great mystery for particle physics.