Gravitational waves: A primer - BBC Newsnight

Predicted by Einstein, finally confirmed. Rebecca Morelle reports on ripples in the fabric of space and time - aka gravitational waves.

**********
Newsnight is the BBC's flagship news and current affairs TV programme - with analysis, debate, exclusives, and robust interviews.

Follow us on Twitter @BBCNewsnight for the latest updates on #newsnight

Add us on Snapchat - our username is 'BBCNewsnight'