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.

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 …

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, …

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 …

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

Jan 15, 2026 · The top priority of the last two planetary science decadal surveys, sample return from Mars, is key to helping scientists better understand the geological and possible astrobiological history …

Jan 1, 2026 · Feb. 28: Planetary alignment. Six planets — Mercury, Venus, Jupiter, Saturn, Uranus, and Neptune — will trace an arc across the night sky, though some (Venus, Jupiter, Saturn) will be much …

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 …

Jan 15, 2026 · 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 …