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.

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, …

What’s up in the night sky: February 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.

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

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.

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 …

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 …

We've sent names of Planetary Society members and supporters on 20 space missions. The Magellan Venus orbiter; the Mars rovers Sojourner, Spirit, and Opportunity; and the asteroids Braille and …

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, and joy of …

The Planetary Society conducted this workshop and wrote this report in an effort to add a constructive voice to the conversation about the future of human spaceflight. The question we want to address: "is …