The team examines the threat of space weather, meeting some of the dedicated people working to keep the Earth safe from the very worst that the Sun can throw at it. Chris Lintott meets Jim Wild, the president of the Royal Astronomical Society, learn about the Carrington Event of 1859, when a massive solar storm caused aurorae as far south as the Caribbean. Maggie Aderin drops into Warwick University to discover how Dr Ravindra Desai's research is helping people grasp how the matter spat out by the sun interacts with the Earth