Co-founded by Carl Sagan in 1980, The Planetary Society is a member-funded nonprofit organization dedicated to advancing space science and exploration through three core enterprises.

They established The Planetary Society to give anyone from anywhere in the world an active role in advancing space exploration. Today, The Planetary Society continues this work, under the …

Explore the membership options of The Planetary Society and join fellow space enthusiasts in advancing space science and exploration.

The Planetary Society celebrates the Perseverance rover landing with hundreds of members at our virtual Planetfest ‘21, while also marking two mission milestones: the first audio from Mars, thanks to …

The latest stories from The Planetary Society, featuring humanity's quest to explore worlds, find life, and defend Earth.

What is a Planet? It's right there in our name: The Planetary Society. But what is a planet? This seemingly simple question is the subject of much debate. Learn More

The Planetary Society is the world's largest community of space enthusiasts, started by famed astronomer Carl Sagan and today led by celebrated science educator Bill Nye.

We connect with planetary exploration experts from around the world to strengthen our work and support international exploration efforts. Our 50,000+ international membership makes us the largest, …

The Planetary Society is working to change the launch date to 2029. ESA's EnVision will launch no earlier than 2031 to investigate Venus' atmosphere and overall structure.

The Planetary Society conducted this workshop and wrote this report in an effort to add a constructive voice to the conversation about the future of human spaceflight. The question we want to address: "is …