In the fourth episode of this series, 'Is Cosmology Really a Science?', Robin Ince and Brian Cox are joined on stage by 'V for Vendetta' author and legendary comic book writer Alan Moore, cosmologist Ed Copeland, and science broadcaster Dallas Campbell to ask whether cosmology is really a science.Do scientific theories need to be testable to make them, well - scientific? And if so, where does that leave some of the more mind-bending theories that cosmology has postulated over the last few years? From String Theory to the idea of multiple universes, the maths might work, but if there is no way of observing whether it is correct, is it science or science fiction?Does cosmology have more in common with the fantastical stories dreamt up by fiction writers such as Alan Moore, and will science ever progress enough to really get to the bottom of some of the more weird and wonderful theories about the way our universe works? This programme was recorded as part of the Cheltenham Science Festival.