Crowdscience heads to Africa's biggest science festival for a panel debate in front of a live audience that takes us into space then back down to earth to solve listeners' questions. Marnie Chesterton and Anand Jagatia are joined by aspiring extra-terrestrial, Dr Adriana Marais, who hopes to travel to Mars, along with cosmologist Palesa Nombula and sustainable energy expert Dr Sampson Mamphweli. They all explain how solving challenges on the ground will eventually help us set up home in space. Producers: Marijke Peters and Mel Brown Presenters: Marnie Chesterton and Anand Jagatia (Photo: Astronaut walking on Mars. Credit Getty Images)