Huygen, the first probe after Pathfinder to go beyond Mars to send back pictures of an unexplored Moon/Planet. I remember seeing pictures of the Martian surface on TV in 1997. It was surreal for a moment then it started to look like some artist rendering from a movie. They say, Titan is like earth 3 billion years ago.
The Titan probe is named after Christiaan Huygens a 17th century Dutch mathematician.
According to CNN, Huygens discovered the Saturn moon Titan some time in the last half of the 17th century.
For more on the story click here (Yahoo News).
For more on the Cassini-Huygens probe click here.