A long time ago I read “At the Core,” a story by science-fiction author Larry Niven. (Fate-of-the-galaxy spoiler alert.) His protagonist Beowulf Schaeffer was hired by an alien race to pilot a superfast spacecraft to the galactic core. As Schaeffer gets closer he sees a lot of radiation. And as he gets closer yet he discovers that the galaxy is exploding, and in about 25,000 years the deadly radiation chain reaction will reach what is called “known space,” where humans and all aliens that humans have encountered dwell. Soon after Schaeffer reports this to his alien employers, the entire alien race prepares to leave the Galaxy. Schaeffer at first shrugs–who cares about 25,000 years from now?–but then wonders if the aliens, who are considered cowardly, might not be more courageous than we are. At minimum they recognize without denial the danger that they must face, and the sooner the better. Niven ends the story by having Schaeffer think, “Maybe it is the humans who are the cowards–at the core.”