Dark matter
Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not absorb, reflect, or emit electromagnetic radiation and is, therefore, difficult to detect.
2 episodes
Episodes in this category also belong to the following categories:
Dark matter
Melvyn Bragg and his guests discuss dark matter, the mysterious and invisible substance that is believed to make up most of the universe.
12 March 2015
Featuring: Carolin Crawford, Gresham Professor of Astronomy Carlos Frenk, Anne Green
The Neutrino
Melvyn Bragg and his guests discuss the neutrino, a mysterious subatomic particle which is one of the most numerous, and least understood, objects in the universe.
14 April 2011
Featuring: Frank Close, Susan Cartwright, David Wark