Sir Patrick Moore, CBE, is an amateur astronomer, researcher, television presenter, and author of over 70 books on astronomy. He is a former president of the British Astronomical Association, co-founder and former president of the Society for Popular Astronomy, and is a Fellow of the Royal Society. Dr Chris North is an academic researcher at Cardiff University's School of Physics and Astronomy, a co-presenter of The Sky at Night, and has worked on the Planck Satellite and the Herschel Space Observatory.