CAPE CANAVERAL, Fla. (AP) — For more than a decade, NASA's Cassini spacecraft at Saturn took "a magnifying glass" to the enchanting planet, its moons and rings.

Cassini revealed wet, exotic worlds that might harbor life: the moons Enceladus and Titan. It unveiled moonlets embedded in the rings. It also gave us front-row seats to Saturn's changing seasons and a storm so vast that it encircled the planet.

"We've had an incredible 13-year journey around Saturn, returning data like a giant firehose, just flooding us with data," project scientist Linda Spilker said this week from the Jet Propulsion...