That was "Voyager 2".
Yes, the Voyager 2 probe visited all four gas giant planets; Jupiter, Saturn, Uranus and Neptune. It flew by Neptune in 1989.
Voyager 2 flew by four planets; Jupiter, Saturn, Uranus and Neptune.
All four outer planets. Voyager 1 flew by Jupiter and Saturn only, and Voyager 2 flew by Jupiter, Saturn, Uranus, and Neptune. Pluto, which is no longer considered to be a planet, was not included in the fly-by.
Jupiter (Voyager 1 & 2)Saturn (Voyager 1 & 2)Uranus (Voyager 2)Neptune (Voyager 2)See related link for a full description of the Voyager exploration
Voyager did not discover any new planets. By the time Voyager was launched we already knew of all the planets in our solar system that we know of today. There were also two Voyager probes, not one. The first planet that either probe studied was Jupiter, which we had known for millennia. Voyager 1 flew by Jupiter in March 1979 while Voyager 2 flew by in July of the same year.
In the year 1974 NASA's Mariner 10 space probe flew by the planet Venus. Later in the year the same probe flew by the planet Mercury, the first flyby of the planet in human history.
Voyager II is the first successful space probe that reached the outer planets or Jovian Planets. It is in the rule of probes that they should not reach the outer planets because it is too far and their probes might malfunction. But this Voyager II probe had a successful flight to the outer planets.
No. There are no artificial satellites orbiting Mercury, Uranus, or Neptune. Mercury has had artificial satellites in the past that were deliberately deorbited when their missions ended. The space probe Voyager 2 flew by Uranus and Neptune, but since it never orbited them, it cannot be considered a satellite. Similarly, New Horizons flew by Pluto, which is no longer considered a planet. The one space probe orbiting Saturn, named Cassini, will be deorbited in September 2017.
mars and venus
The range of four probes gives you the material to test the probe. The best way to determine the optimum choice of the probe tip for specifications for a given material is the four points.
NASA has launched the Kepler mission to search for new planets.
You missed it. It flew by Jupiter on 28 February 2007