For the last 13 years, NASA's Cassini spacecraft has spied on Saturn and its many moons. Turns out, this region of space could hold the greatest secrets of our solar system. Here are 5 of the most ...

The 20-year journey of the Cassini-Huygens mission, which came to an end in September 2017, has provided us with a trove of data from which we’ll mine vital information in the years to come.