What happened in the 1970s?
π Space Exploration: Pioneer 11 sends first close-up images of Saturn (1979)
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Further Reading
Pioneer 11 - NASA Science (nasa.gov)
A Lone Pioneer Paved the Way Past Saturn - APPEL NASA (nasa.gov)
Pioneer 11: Up Close with Jupiter & Saturn - Space.com (space.com)
Visiting Saturn: 40 Years Since Pioneer 11's Mission to Giant ... (americaspace.com)
Pioneer 11 approaches Saturn | The Planetary Society (planetary.org)
Pioneer 11 - Wikipedia (wikipedia.org)
Sept. 1: Pioneer 11 Becomes 1st Spacecraft to Visit Saturn - YouTube (youtube.com)
50 years ago, Pioneer 11 set sail for the outer solar system (astronomy.com)
PIONEER β First to Jupiter, Saturn, and Beyond (nmsu.edu)
Pioneer Saturn Encounter, by NASA: a Project Gutenberg eBook (gutenberg.org)