yes voyager 2
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.
Neptune has not had any space exploration missions. However, it has been visited by the Voyager 2 spacecraft, which flew by the planet in 1989 and provided valuable information about its atmosphere, moons, and rings. There are no current plans for future missions to explore Neptune directly.
There have been no space shuttle landings on Neptune. It would be impossible to land on Neptune for two reasons: 1 - Neptune is a gas giant 2 - Neptune is freezing cold, electronic equipment would freeze and malfunction
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None.
The Voyager 2 space probe did a flyby of Neptune on August 25th 1985, beaming back images and data to Earth. Nothing can land on Neptune because it is a gas giant. Gas giants do not have a solid surface.
We haven't gone to Mars yet. That's like hopping on a plane as soon as your about to land.
The answer depends on "before what".
As of 2021, no space crafts have visited Eris, the dwarf planet located in the outer solar system. Most of the information we have about Eris comes from observations made from telescopes here on Earth.
No space missions have landed on Neptune or flown by it. The only spacecraft that has visited Neptune is Voyager 2, which conducted a flyby of the planet in 1989. There are no current plans for future missions to Neptune.
Only one space probe went to or flew by Neptune which was Voyager 2.
I am certain that Voyager1 and Voyager2 in the '70s.