A probe to study the Trojan asteroids is expected to take off this week, but what will this mission uncover about the formation of the solar system? Also, we explore new technology to observe asteroids, as well as a mission to deflect an incoming celestial object. And, we hear from the Nobel co-laureate in Physiology or Medicine, Ardem Patapoutian, about temperature and pressure sensing. Alok Jha hosts.  For full access to The Economist’s print, digital and audio editions subscribe at economist.com/podcastoffer and sign up for our new weekly science newsletter at economist.com/simplyscience. Terms and conditions for the book competition featured in this podcast are available at economist.com/podcast-contest.   See acast.com/privacy for privacy and opt-out information.