The First Aircraft that ever visited the planet is the dumbest question, Don't you know how to specify questions fool?
Dear Wiki Questioner, The first spacecraft that visited the planet Mars was the "Mariner 4". It was launched by NASA in 1964 and simply flew past Mars, taking pictures and gathering information as it passed! The first spacecraft to LAND ON Mars were the "Mars 2" and "Mars 3" probes launched by the USSR in 1971. Unfortunately, both of these probes stopped functioning not long after landing on Mars. NASA's "Viking 1" lander was the first spacecraft to land on Mars and function for an extended period of time (6 years in fact). You can Read more on this subject by visiting the following web page: http://en.wikipedia.org/wiki/Mars#Past_missions
The spacecraft that landed on Mars in the 1970s was the Viking 1 Lander. It was the first spacecraft to have landed on Mars on July 20, 1976.
The Mars Science Laboratory landed on Mars in August 2012. It is a car-sized rover designed to investigate Mas for traces of life/the potential for life in the past.
Voyager 2 is the only spacecraft to have currently visited both.
the milklyway
Voyager
A spacecraft didn't visit Jupiter it is just a ball of gas.
A spacecraft didn't visit Jupiter it is just a ball of gas.
the Mariner 4 launched in 1964 by NASA
It was Mars 2, from the Soviet Mars Lander Program.
Voyager 1, or if you live in the world of Star Trek...VGER.
Luna 2 and Ranger 4 both smashed into it while Apollo 11 was the first to land with people.