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Jupiter
Jupiter was first.
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.
Jupiter
The first spacecraft to visit Jupiter was pioneer 10 in 1973, followed a few months later by Pioneer 11. Aside from taking the first close-up pictures of the planet, the probes discovered its magnetosphere and its largely fluid interior. The voyager 1 and Voyager 2 probes visited the planet in 1979, and studied its moon and the ring system, discovering the volcanic activity of Io and the presence of water ice on the surface of Europa. Ulysses further studied Jupiter's magnetosphere in 1992 and then again in 2000. The Cassiniprobe approached the planet in 2000 and took very detailed images of its atmosphere. The New Horizons spacecraft passed by Jupiter in 2007 and made improved measurements of its and its satellites' parameters.
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
The first astronomer to study the planet Jupiter with a telescope was none other than Galileo.
Galileo was probably the first to study Jupiter in detail, with his telescope.
The planetery rings of Jupiter were first observed by the Voyager 1 probe in 1979.
1977 was the first time a satellite passed Jupiter They were the Voyager Missions
The first gas planet in our solar system is Jupiter. It is the largest planet and is composed mainly of hydrogen and helium.
On March 5, 1979, Voyager 1 made its closest approach to Jupiter, capturing detailed images of the planet and its moons. Voyager 1's flyby provided valuable insights into Jupiter's atmosphere and magnetic field, and its discoveries paved the way for future missions to outer planets.