Voyager 2 flew within 3000 miles of Neptune's surface, revealing that it rotates every 16.1 hours. Discoveries include Neptune's strong winds up to 1500 mph, a magnetic field that is shifted 50 degrees in relation to its rotational axis. Neptune's largest moon Triton was found to be surprisingly cold at a 40°K surface temperature.
A visual chronology of Asimov's ~1500 scientific inventions and discoveries.
