Del Rey / Ballantine, 1984. Hardcover with dustjacket, "First Edition: March 1984" stated on the copyright page with a complete number line: "10 9 8 7 6 5 4 3 2 1". Novel set in a a gas torus, a ring of air around a neutron star. There is a sequel, "The Smoke Ring" (1987). Nominated for the Nebula and Hugo Awards for Best Novel.