Cassini-Hyugens was a probe launched for the Saturn orbit in 1997, reaching its destination in 2004. Since then it has been providing NASA with photos and videos directly from the planet's surface. The Hyugens shuttle split off from Cassini for a special trip to Titan, one of the moons of Saturn, successfully  landing in 2005

The Chandra X-Ray observatory scans the abyss with a very powerful X-Ray telescope that can see hundreds of times more clearly than any other telescope ever made. It was Chandra that saw the crushed star left by a supernova when the vessel was observing Cassiopeia A.

Viking 1 was the first man-made object to land on Mars without failure, following 2 Soviet probes that landed, but didn't stay operational for long. The Viking was responsible for sending color pictures of the red planet back to NASA and currently has the longest Mars mission under its belt - 6 years and 116 days.