The probe, Voyager 2, made its closest approach to Neptune in 1989.
There have been no astronauts that have gone to Neptune. Nor is there any space exploration projects or programs called Neptune that I am aware of.
no not yet
No, there have been no human landings on Neptune for the following reasons: - Technology. We currently do not have the technology to build space shuttles capable of travelling further than our own orbit and moon. - Temperature. Planet Neptune is freezing. Any human who gets close to the planet would freeze to death in seconds. Any electrical equipment would also freeze, jam and malfunction. - Distance. Neptune is millions of miles away. It would take years to get there if we had the capability to. However Neptune has been explored with unmanned exploration satellites.
no
yes voyager 2
Voyager 2 visited it in 1989.
No. Astronauts have never been anywhere near any astronomical bodies except Earth and the Moon.
no
There are a number of geological events that have been established on Neptune. For instance, there are four seasons just like on earth but one season in Neptune last for 41 earth years.
no, water has not been found on neptune to sustain life
The Voyager I and the Voyager II are the only space probes to visit Neptune. They landed in the 1980s.
No. Neptune is a gas planet.