Never happened.
Never. The Hubble telescope has never left orbit around Earth.
The HST never has got to Neptune. It always orbited Earth at 569 km above the surface. You confuse HST with the Voyager spacecraft. Voyager 2 had the closest approach to Neptune on Aug. 25, 1989.
2005
Hubble has never "explored" Neptune. It is a telescope in orbit round Earth and from Earth it has "imaged" Neptune. It has done this several times eg 1996 and 1998 (there may be more times!).
Voyager 2 flew past Neptune in August 1989. The HST took its first pix of Neptune in 2005.
The same planets that orbit today, though Uranus and Neptune had yet to be discovered, along with Pluto (now regarded as a Dwarf Planet).
No spacecraft has ever landed on Mercury. A couple have orbited around the planet.
a lot! it takes about 10,980 earth days to make up a year for neptune to go around the sun and back!
Now that Pluto has been downgraded to a dwarf planet, Neptune is the most distant planet from the Sun. It takes 164.79 Earth years for Neptune to circle the Sun, so one Earth year would be about 1/165 of a Neptune year (the time it takes Neptune to circle the Sun).
it takes 165 Earth years for Neptune to revolve around the sun.
On Earth you would be 12 years old. On Neptune, assumming a year is one orbit around the Sun, you would not even be one year old, as a year on Neptune is 164.70 Earth years.
Neptune takes about 165 Earth years to orbit around the sun once. This means Neptune's year is equal to approximately 165 Earth years.