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.

What’s up in the night sky: December 2025 Our monthly feature focuses on easy and fun things to see in the night sky, including eclipses, supermoons, meteor showers, planetary conjunctions, and more.

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 …

For over 4 decades, our members have made strides in advancing planetary exploration, planetary defense, and the search for life beyond Earth. We have delivered tens of thousands of petitions to …

Dec 9, 2025 · The Planetary Science Caucus, now in its second year, is officially reorganized and has hit the ground running; organizing against the devastating proposed cuts and rallying bipartisan …

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.

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.

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

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, …

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.