On the Cover: From the edge of our planetary system, the spacecraft Voyager 2 transmitted back to Earth images of Neptune, its large moon Triton, its strange ring system and its retinue of small satellites. In this montage constructed from high-resolution images, the south pole of Triton dominates, with cloud-streaked Neptune in the background. The flyby of Neptune in 1989 was the last Voyager planetary encounter. These two doughty spacecraft opened up the outer solar system for scientific exploration, and we shall not see their like again. Alfred McEwen, USGS Flagstaff
4 The Elusive Rings of Neptune: Carolyn Porco tells the story of the pursuit of Neptune's rings.
10 The Magnetosphere of Neptune: S. M. Krimigiscompares the magnetic fields of Earth and the gas giants.
14 Triton: Voyager's Finale: R. H. Brownshowcases one of the solar system's most amazing, perplexing, and beautiful objects.
18 The Clouds and Winds of Neptune: Reta Beebereveals what Voyager 2 has taught us about the atmosphere of Neptune.
22 Neptune's Small Satellites: Peter Thomaslooks at Neptune's retinue of moons.
3 Members' Dialogue Space station Freedom; Earth impact hazard.
25 Society Notes See Mars Observer launch; Gene Roddenberry's last gift.
26 World Watch Monitoring Russia's Mars program; NASA's budget.
28 Q&A How do you fly into outer space?
Let's Change the World
Become a member of The Planetary Society and together we will create the future of space exploration.