Rocheworld (first published in serial form in 1982; first book publication, under the title The Flight of the Dragonfly, 1984) is a science fiction novel by Robert Forward which depicts a realistic interstellar mission using a laser driven light sail propulsion system to send the spaceship and a crew of 20 on a one-way journey of 5.9 light-years (ca. 34 trillion miles; ca. 56 trillion km) to explore a double planet that orbits Barnard's Star, which they call Rocheworld, and where they make many startling discoveries.