What is the most distant object from the earth that a spacecraft visited has visited so far? What was the mission and when did it happen?
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Depending on your definition of "object," Neptune is currently the farthest. It was visited by Voyager 2 in 1989. New Horizons will be visiting Pluto in 2015
If by object you mean cosmic structure though, then Voyager 1 is currently in the Heliosheath and is expected to reach the heliopause by 2015. These are regions that describe interactions between the sun's solar wind and the interstellar medium.
Carson Myers
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We landed on Titan in 2004. That is definitely a milestone in being far away and landing on the surface of something big. Source
It's a damn shame they didn't manage to get a better photograph of the surface.