It had taken 12 years to get there and yet passed within 3000 miles of the planet's surface. Neptune's atmosphere was seen to have a banded structure similar to that found on the other gas giant planets. Neptune was shown to have a very active cloud system, possibly even more active than that of Jupiter. Moons Neptune has 8 moons. The two largest, Triton and Nereid are inclined at 20 and 30 degrees to Neptune's equator.
Triton orbits Neptune in the opposite direction to the other moons.
The pictures show vast canyons, craters and peaks with frozen pools of ice and ammonia and long fissures. The most surprising discovery was of volcanoes. These are quite different from the volcanoes on the Earth. Instead of red-hot magma, they eject nitrogen gas and darker carbon compounds from below the moon's surface.