The day Carl Sagan died, the Voyager was sailing somewhere past Neptune, toward the boundary of interstellar space, beyond which lay the open cosmic sea of the unknown. Thirty-five Augusts after the launch, Voyager 1 began crossing the wide, ruffled edge of the Solar System, still carrying what now lived up to Carl and Annie’s vision of a truly interstellar record—a record they believed “intentionally expresses a kind of cosmic loneliness.”
