#5
Cassini-Huygens
Cassini-Huygens remains the most comprehensive Saturn mission ever flown, orbiting the ringed planet for 13 years and delivering over 453,000 images. The spacecraft ended with a deliberate 2017 dive into Saturn's atmosphere to protect pristine moons—a finale that cost $3.26 billion but returned science worth an estimated $7.2 billion in discovery value.
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