Beth Hello, this is 6 Minute English from BBC Learning English. I'm Beth. Phil And I'm Phil. Beth Phil, do you believe there's life on other planets? Phil Well, there's a lot of other planets, so yeah, I think there must be. Beth Yeah, I agree. Well, it's a question that interests American astrophysicist Adam Frank, who discussed it with his colleague Gavin Schmidt, director of Nasa's Institute for Space Studies. Here, Adam recalls their conversation for BBC World Service programme CrowdScience: