Voyager 2 is the only spacecraft to have visited Neptune. The probe's closest approach to Neptune was on 25 August 1989.
saturn has only been visited 4 times by spacecrafts
none
None, although Voyager 2 did a fly by in 1989
None.
a billion.....
1 time Neptune has been vist
No astronauts, but many robots have been there.
yes
none. they were all secretly robots
There have , as of yet , been none .
There have been no known robots on Venus. Due to the extreme environment on the planet, such as high temperatures and pressure, it is difficult to send robots there.
As of now, only one satellite has explored Pluto: NASA's New Horizons spacecraft in 2015. No robots have directly explored Pluto's surface, but data collected by New Horizons has provided valuable insights into this distant world.