Unsolved problems in astronomy
Some of these unsolved problems in astronomy are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.
4 episodes
Episodes in this category also belong to the following categories:
Dark Energy
Melvyn Bragg discusses the recently discovered, and mysteriously named, 'dark energy' which may make up 70% of the universe.
17 March 2005
Featuring: Martin Rees, Carolin Crawford, Roger Penrose
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
Extra Terrestrials
Melvyn Bragg discusses whether there are reasons to suppose that some form of life might exist beyond, or even within, our solar system and what our chances of ever discovering such a planet are.
4 April 2002
Featuring: Simon Goodwin, Heather Couper, Ian Stewart
The Universe's Shape
Melvyn Bragg discusses shape, size and topology of the universe and examines theories about its expansion. If it is already infinite, how can it be getting any bigger? And is there really only one?
7 February 2002
Featuring: Martin Rees, Julian Barbour, Janna Levin