A Space Expedition Traveled Past Jupiter And Found A Wall

One January night in Nebraska, a high school science teacher watches a star slip behind Saturn's largest moon and stay lit four seconds too long. He checks his equipment twice. Nothing is wrong.

Two years later, after other amateurs have caught the sky in small mistakes of their own, the nation's beloved space program offers him a seat on a flight to the edge of the solar system. Aboard, the sky reaches the crew on screens, redrawn every second. One man refuses to look at them: an aging map historian who plots their course by hand...