Pythagorean Astronomy

In October 2015 we had news of the discovery of water on Mars – again! Almost a perennial story now, but is this discovery any different to previous discoveries, some of which stretch back to the 1970s? To find out more about this particular story, I spoke to UCL planetary scientist Peter Grindrod. Originally broadcast on 29th October 2015 as part of Pythagoras’ Trousers on Radio Cardiff.