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.
Never happened.
Never. The Hubble telescope has never left orbit around Earth.
1990
April, 1990.
The HST was launched on April 24, 1990.
There is only one single Hubble Space Telescope. It was placed into Earth orbit in April of 1990, and is expected to remain useful and productive until sometime between 2014 and 2020.
The Hubble Space Telescope was launched into orbit aboard NASA's space shuttle Discovery (mission STS-31) on April 24, 1990.The Hubble Space Telescope was originally meant to be launched in 1986, but the explosion of the space shuttle Challenger delayed the launch until April 24th 1990.The Hubble telescope is now seen as one of the most versatile telescopes in space. After it was launched in 1990, astronomers had a chance to change and improve the telescope through missions by astronauts aboard the Space Shuttle.
The Hubble Telescope was sent into space in 1990. It was designed and built for several years before that. As of 2014, it is still in operation.
The Hubble Space Telescope was put into the orbit in 1990 and is still there up until today. It already had to be repaired five times and is expected to stay in the orbit until at least 2013.