A NASA spacecraft named Lucy blasts off on a mission to the Trojans, a group of asteroids over 400 million miles from Earth thought to hold important clues about the origins of our solar system. Just hours before, in Senegal, West Africa, a team of scientists sets out to capture extraordinarily precise observations vital to the success of the mission. Producers: Laurie Cahalane, Susanne Lummer, Sabine Holzer, Walter Köhler. Narrator: Judith Chandler. Author: Ruth Berry