The Buzz is back! And in our second season we'll be attempting - with the help of our academic experts - to answer some of the biggest questions in science and engineering.

In this episode we speak to Dr Eamonn Kerins, an astrophysicist at The University of Manchester's Jodrell Bank Centre for Astrophysics, who tackles one of the most intriguing questions not only in the world, but the whole Universe: Do aliens exist?

It's something we've all pondered while looking up at the night sky - and Dr Kerins, a leading expert on the use of gravitational lensing to find exoplanets, offers unique insight into some of the fascinating theories and ideas that could, one day, uncover the truth.