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: March 2026 Our monthly feature focuses on easy and fun things to see in the night sky, including eclipses, supermoons, meteor showers, planetary conjunctions, and more.

We provide free, accessible information to the public like our weekly radio program and podcast Planetary Radio, videos, articles, social media, The Planetary Report magazine, public events, and …

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

Jan 21, 2026 · Designed for ages five through nine by Bill Nye and the curriculum experts at The Planetary Society, The Planetary Academy is a special membership subscription for kids and …

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 …

Our monthly feature focuses on easy and fun things to see in the night sky, including eclipses, supermoons, meteor showers, planetary conjunctions, and…

Dec 8, 2025 · Milky Way on the alpine tundra Planetary Society member Zaakary Barnes photographed this panorama of the Milky Way over Colorado’s Rocky Mountain National Park in June.

Nov 26, 2025 · Throughout 2025, The Planetary Society has featured over a dozen fantastic books that explore all facets of space exploration. From our monthly space book club picks to authors who …