Theories of gravity
In physics, gravity (from Latin gravitas 'weight') is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction.
2 episodes
Episodes in this category also belong to the following categories:
Quantum Gravity
Melvyn Bragg discusses the attempts to understand the Quantum world, which deals with the smallest invisible particles, and to which classical theories of gravity, motion and relativity do not apply.
22 February 2001
Featuring: John Gribbin, Lee Smolin, Janna Levin
Theories of Everything
Melvyn Bragg discusses the prospect of a single theory to solve the riddle of black holes, the Big Bang and the mystery of time travel. Why do we need one and what would it mean if we had it?
25 March 2004
Featuring: Brian Greene, John Barrow, Val Gibson