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Defend Earth
Mariner Mark II (Cassini)
The Cassini spacecraft, originally dubbed the Saturn Orbiter/Titan Probe (SOTP), was based on a new vehicle design called the Mariner Mark II.
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The Planetary Fund
Accelerate progress in our three core enterprises — Explore Worlds, Find Life, and Defend Earth. You can support the entire fund, or designate a core enterprise of your choice.
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The Planetary Society
Our Vision
Know the cosmos and our place within it.
Our Mission
Empowering the world's citizens to advance space science and exploration.