New discoveries have revealed thousands of exoplanets beyond our solar system, and some resemble earth enough that one could be a new home for humanity. But even with cutting-edge technology, finding the perfect one is the scientific challenge of the age.

For twenty years, NASA's Cassini spacecraft revealed the strange secrets of Saturn until it vaporized in its atmosphere in a blaze of glory. But today its legacy lives on, as fresh data from the probe helps scientists make brand-new discoveries.