Space Boffins are live on stage at Astrofest 2019 in London with a stellar line-up of guests to discuss landing on Phobos, weirdly-shaped space rocks and Europe's mission to Mercury. They're joined by science writer Stuart Clark, the Japanese Space Agency's Elizabeth Tasker, New Horizons scientist Simon Porter and Suzie Imber, who's working on the BepiColombo mission. Also featuring live audience participation with how best to pronounce Houston and, completely unrehearsed, audience whooping.