I think that they have tried but failed. But i could be wrong...
The First Aircraft that ever visited the planet is the dumbest question, Don't you know how to specify questions fool?
yes, spacecraft have visited Mars, but the results haven't always been positive. More than half of the attempts to send a spacecraft to the planet have failed.
yes
venus was the first planet visited by the American spacecraft
It's the closet and rather similar to the earth.
Mars has constantly been visited by spacecrafts. The first spacecraft to visit Mars was the Mariner 4. After that Mars has been visited by numerous spacecrafts like: Mars Pathfinder, Mars Global Surveyor, Mars Odyssey, Mars Express and the Mars 2 which was the first spacecraft to land on Mars.
As for as is known no earthlings have ever been on Mars.
No person has ever visited Mars yet.
The Mariner spacecraft landed on the planet Mars, and the Apollo spacecraft landed on the moon.
Humans, no. Unmanned spacecraft, yes.
No human has really visited any planet other than Earth; the Moon isn't a planet. However, spacecraft have visited other planets, such as the Spirit and Opportunity rovers, who went to Mars
Since no humans have visited Mars, it is unsure. But Mars is often mistaken for UFOs because of how bright the planet is.