The trip can only be a fly-by.
Neptune is a gas giant. Meaning it has no solid surface. if anything tried to land or walk on Neptune, it would sink into the planet and be incinerated by the molten ammonia core.
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 spacecraft has visited Neptune: NASA's Voyager 2 probe, which made a flyby of the planet in August 1989. Voyager 2 provided our first close-up images and scientific data of Neptune and its moons.
To date, only one has reached Neptune so far. Voyager 2 did a flyby of Neptune in August 1989, sending images and data back to Earth.
Only in space. A spaceship on land is called a landship and a spaceship in the ocean is, ironically, misnomered a seaship.
Not yet. And there never will be a spacecraft landing on Neptune. The reason being, because Neptune is a gas giant, it has no solid surface for a spacecraft to land on. Neptune is also freezing cold. Electronic equipment such as a spacecraft would freeze up and malfunction in its atmosphere and most likely end up being consumed by the exposed molten ammonia core.
Why could voyager to fly past Saturn Uranus and Neptune even know it left earth with only enough energy to reach Jupiter
There have been none. The only direct study of Neptune was done during the flyby of Voyager II in August 1989. It passed within 5000 km of Neptune and relatively close to the moons Nereid and Triton.
No satellites have directly explored Neptune, but the Voyager 2 spacecraft did a flyby in 1989, providing valuable data and images of the planet. Currently, there are no dedicated missions to Neptune, but some spacecraft may conduct flybys of the planet as part of their trajectories to other destinations in the outer Solar System.
So far only one spacecraft has ever flown by Neptune and that was Voyager II in 1989. Neptune is extremely far away from the Sun, and getting there would be highly expensive and take many years to get there, so it doesn't look likely we'll be getting any more Neptune probes soon.
The one and only object was Voyager 2. it passed by Neptune in August 25, 1989.
No spacecraft have directly visited Neptune. The only close-up observations of the planet were made by NASA's Voyager 2, which flew by Neptune on August 25, 1989. This flyby provided valuable data about the planet's atmosphere, rings, and moons, but no missions have been sent specifically to study Neptune since then. Future missions to explore Neptune are still being discussed by space agencies.
Neptune was not discovered by spacecraft. The existence of Neptune was predicted on paper by Frenchman Urbain Le Verrier and Englishman John Couch Adams. It was later discovered by telescope by Johann Gottfried Galle in 1846. Voyager 2 did a flyby of Neptune in 1989 and sent images back to Earth. But it did not discover it.