Cassini–Huygens-level science from NASA’s “Neptune orbiter with probes” vision mission (PDF) The Case For A Neptune Orbiter/Multi-probe Mission (PDF) Neptune Revisited Reaching Toward Neptune: Two Ways to Explore an Ice Giant
Вояджер (программа) Uranus orbiter and probe Новые горизонты Cassini-Huygens-level science from NASA’s «Neptune orbiter with probes» vision mission (PDF) The Case For A Neptune Orbiter/Multi-probe Mission (PDF) Neptune Revisited Reaching Toward Neptune: Two Ways to Explore an Ice Giant NeptuneProbe