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 …

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 …

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, …

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.

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

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 …

Dec 20, 2024 · Mars spiders and space policy myths — the latest on Planetary Radio. If “Mars spiders” sound intriguing to you, listen to this week’s episode of Planetary Radio to learn all …

Apr 10, 2025 · How to spot comet SWAN (C/2025 F2) Written by Asa Stahl, PhD Science Editor, The Planetary Society April 10, 2025 Update: comet SWAN may be disintegrating as it …

Apr 30, 2025 · If you love the show, you can get Planetary Radio T-shirts at planetary.org/shop, along with lots of other cool spacey merchandise. Help others discover the passion, beauty, …