Dr Rhodri Evans studied physics at Imperial College London, graduating with first class honours, before gaining his PhD in astrophysics from Cardiff University. He has taught at the University of Toledo in the USA, at Swarthmore College and done post-doctoral research at the University of Chicago’s Yerkes Observatory, ‘the birthplace of modern astrophysics’. He is currently a research fellow at Cardiff University with a particular interest in infrared astronomy. Rhodri is the author of numerous academic papers as well as articles in popular science, he speaks regularly at conferences and is a frequent contributor to the BBC on physics and astronomy. His website can be found at http://rheastro.com and you can read his popular blog at http://thecuriousastronomer.wordpress.com.