15 MILLION DEGREES

Professor Lucie Green is a solar physicist at UCL's Mullard Space Science Laboratory and regularly appears on the BBC's Star Gazing Live with Brian Cox, the Today programme, The Infinite Monkey Cage, BBC Breakfast, Sky at Night and 10 O'clock Live. She works with the world's major space agencies (including NASA), and is helping build Solar Orbiter, a European Space Agency spacecraft that will gradually work its way into an orbit that takes in closer to the Sun than the planet Mercury.