In this special documentary as part of the Pythagoras Trousers radio series, Rhys Phillips visits his alma mater, Cardiff University’s School of Physics & Astronomy, to find out about a new generation of detectors being developed to help see things in the far infra-red part of the spectrum. With contributions from Chris North, Peter Hargave, Simon Doyle and Ken Wood.

Originally broadcast on 2nd April 2015 as part of Pythagoras’ Trousers on Radio Cardiff.