Dr Paul Francis sheds some light on some of life's big questions in this new web series - The Greatest Unsolved Mysteries of the Universe. In this second episode, he addresses the question of the ultimate fate of the Universe.

Each episode explores a mystery in-depth, in an accessible and light-hearted way. Dr Francis will also be delving into some of the comments left on his previous video to answer some viewers' mysteries. If you have a universal mystery you'd like Paul to have a look at, leave it as a comment on this video. He'll be picking a few to look at throughout the series. The series builds on a public lecture given in 2010, also entitled 'The Greatest Unsolved Mysteries of the Universe'.

Dr Paul Francis is an award-winning astrophysics researcher and lecturer at The Australian National University. His research focuses on comets, galaxy formation and novel teaching methods.