TV: Einstein's Theory of Relativity - Dara O Briain's Science Club - BBC

Dara O Briain explains some consequences of SpaceTime from Einstein's Theory of Relativity. Namely the faster you move from a source of gravity like the Earth, the more time you can "acquire". (i.e. to the traveling party, those stationary are living "faster"; whilst to those who remain on Earth, their counterparts in motion live "slower" at any given moment). Dara then chats to Professor Janna Levin about what would happen if two black holes collided.