NASA's Cassini spacecraft, launched in 1977, used the gravitational pull of Venus to act as a sling shot to travel the 2 billion miles to Saturn. Its arrival in 2004 allowed an unprecedented study of the planet's mystical rings and details of what lies below Saturn's seemingly smooth exterior. What has been learned so far (the probe continues to orbit and study) is analyzed, as well as information gleaned from the Huygens probe which landed on its moon Titan.
