Dr Rhodri Evans' main area of research is extra-galactic astronomy. For the past sixteen years he has been involved in airborne astronomy, and is part of the team building the facility far-infrared camera for SOFIA.

He also does research in star-formation and cosmology and is a regular contributor to TV, radio and public lectures.

Brian Clegg, consultant editor, read Natural Sciences, focusing on experimental physics, at Cambridge University. After developing hi-tech solutions for British Airways, he formed a creative consultancy advising clients ranging from the BBC to the Met Office. He has written for Nature, The Times and The Wall Street Journal and has lectured at Oxford and Cambridge universities and the Royal Institution. He is editor of the book review site www.popularscience.co.uk, and his publications include A Brief History of Infinity and How to Build a Time Machine.