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 …

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

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

Mar 28, 2025 · But it is for moments like these that The Planetary Society exists. There is something innately human about joining together for a greater purpose, looking for meaning in the unknown, …

Let The Planetary Society’s weekly podcast take you to the outer reaches of the Solar System and beyond. Host Sarah Al-Ahmed visits with scientists, engineers, mission leaders, astronauts, …

Jan 30, 2025 · From funding early Mars rover testing to naming planetary bodies and developing sample return technologies, Planetary Society members have funded contributions to more than 20 missions …

Oct 1, 2024 · The Planetary Society strongly objected to this retreat from planetary science, a situation characterized by other experts at the time as a “fade to black” for U.S. exploration of the Solar System.

Together with our members and supporters, we’re on a mission to explore worlds, find life off Earth, and protect our planet from dangerous asteroids. Join us at planetary.org.