Elon Musk says humans will land on Mars by 2026 and could eventually move there in large numbers. But science writer Shannon Stirone says that Mars is "a hellhole" and argues that Musk has it seriously wrong. Stirone writes in The Atlantic that the newest images and video from Mars offer more evidence that Earth is the current and future home of human beings. So can human beings ever move to another planet? Should we try? Our guests discuss it: Shannon Stirone , science writer and contributor to