Dark Matter and Dark Energy may sound like the titles of a Harry Potter chapter but they are central to contemporary physics and supposedly account for 95% of the universe. Yet decades on from their observation we still have no idea about what they really are. Are they simply empty hypotheses used to make our current account of the universe credible? Should we be hunting for better theories altogether or just accept our current description of the universe is profoundly flawed?

World-renowned physicist Roger Penrose, Head of Particle Theory at Oxford Professor Subir Sarkar and Professor of Astrophysics Catherine Heymans wonder why we can't find most of the universe.

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