At the frontiers of physics we search for the principles that might unify all the forces of nature and we strive to understand the origin and history of the universe. In this lecture I shall describe some of the the questions that we ask and some of the proposed answers. I shall also discuss what it might mean to have a final theory of fundamental physics and whether we are capable of discovering it.

The STAG Research Centre brings together world-leading academics from three research groups ¨C Particle Physics, Astrophysics and Gravitation ¨C to explore issues of fundamental physics and astronomy.