Voyager 2 in 1989.
Unfortunately, no one has ever visited Neptune as we currently lack the technology to venture out that far into space. Did you know that the Voyager 2 was the first and only spacecraft to ever visit the planet?
This question does not make any sense.
Voyager 2 visited it in 1989.
It may be possible in the future, but today we are not able to travel that far.
the first space craft to go any where near Neptune was Voyager 2 on August 25, 1989
yes lots of space probes
Yes
Yes.
no
yes
It's to cold so no one has visited Neptune. It's to far from the sun. No human being has ever visited ANY planet not event Mars. The time taken for the journey would be so high that we do not have the present technology to support it (even a journey to Mars would take about 7 months which is too much to keep foods, oxygen and other materials for just a single person). Then there is of course the question of cold.
Yes or else how would we know anything about it