In this week's questions show, I introduce Ona, by request. I explain why I don't think going to space is going to fix the big challenges that humanity faces, and how do astronomers figure out how big a planet is? Talking about existential threats with Phil Torreshttps://www.youtube.com/watch?v=XKYTrKapyrs00:00 Meet Ona02:00 Will going to space fix our evil humanness? 04:40 Sparks under the space shuttle main engine05:27 How do we know how big a planet is? Want to be part of the questions show?