PICNIC PLANET

An astrophysicist tries to help out a pair of space-traveling picnickers searching for just the right spot.

The space-suited duo—one brown-skinned, the other presenting Asian in Hsieh’s cartoon illustrations—try Mars first but turn out to be picky sorts who demand a place with grass, trees, and a babbling brook. There’s nothing for it, then, but to bid the planets of our solar system goodbye one by one (“Back in a jiff, Jupiter!”) and try out Stahl’s much more far-flung suggestions…all of which, he explains in an expansive afterword, are real places. Proxima Centauri b? “Um. Beautiful, in its own rugged way.” But not much atmosphere. Gigantic HR 8799 e? Plenty of atmosphere, but any core surface is probably a “super-hot mess.” Other possibilities turn out to have issues, too, like being so close to its star that you age a year in just four hours or lacking a star altogether. Stahl’s final idea may not have a woodsy setting, but readers might find it more feasible: Why not spread a blanket up on a roof? “Then all you need are stars,” he notes, as readers get a final view of the young voyagers sitting on a rooftop, admiring a sparkling nighttime vista overhead. The source list at the end is all technical reports, and if the depictions of exoplanets and attendant stars are speculative, all are based on current information. (This book was reviewed digitally.)

Too far to go in a spaceship but just right for a flight of imagination.