Three of the era's most recognizable science communicators sit down to argue about the biggest questions there are: Stephen Hawking and Arthur C. Clarke share a studio set while Carl Sagan joins by satellite link from elsewhere, the three of them trading positions on camera in something closer to a moderated conversation than a lecture. The Big Bang comes up as a starting point, followed by whether it leaves any room for God, what it would take to call the universe explicable, and whether life exists anywhere else in it. Clarke brings his science-fiction writer's instinct for the plausible, Sagan argues from an astronomer's sense of scale and probability, and Hawking weighs in with the physicist's version of the same questions he was working on in his own research. The format is plain: three chairs, a satellite feed, and an unscripted back-and-forth between people who spent their careers thinking about exactly this.