Explore Worlds
Find Life
Defend Earth
Where did we come from? Are we alone in the Universe? We can only answer these questions by exploring the planets and other worlds of our solar system and beyond. Learn why these worlds are so important, and how you can get involved.
Mercury, Planet of Extremes
Mercury can teach us how planets form and what the early solar system was like when life arose on Earth.
Venus, Cloudy With A Chance of Life
Venus may have had oceans and been habitable to life before being transformed into an inhospitable wasteland.
Earth
Earth is our home and the only world known so far to harbor life.
The Moon, Preserving Earth's Origin Story
The Moon is the only world besides Earth ever visited by humans. By studying it, scientists can piece together Earth’s origin story.
Mars, the Red Planet
Mars once had liquid water on the surface and could have supported life. We don't know how it changed to the cold, dry desert-world it is today.
Asteroids, Comets, and Other Small Worlds
These leftover planet-building materials are time capsules that give us a peek into our origins.
Jupiter, the Planet with a Solar System of Its Own
Jupiter, our largest planet, teaches us how solar systems evolve. Its four planet-like moons make it a solar system of its own.
Saturn, Planet of Rings, Moons, and More to Explore
Saturn is the crown jewel of our solar system. It has a stunning set of rings, diverse moons, and so much more to explore.
Uranus, the Sideways Planet
Uranus may be the butt of all planet jokes, but there's much more to this world than potty humor.
Neptune, Planet of Wind and Ice
Neptune, our outermost planet, is a windy blue world with exotic ice, raging storms, rings, and a moon that could have a subsurface ocean.
Exoplanets, Worlds Orbiting Other Stars
We know of more than 4,000 planets orbiting other stars. Does one of them host life as we know it?
A Pale Blue Dot
Look again at that dot. That's here. That's home. That's us.
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 MoreLatest Articles
Jupiter Mission by China Could Include Callisto Landing
China plans to select one of two Jupiter mission concepts that would launch in 2029 and arrive in 2035.
Jupiter and Saturn Great Conjunction Viewing Guide
There's still time to get outside and see Jupiter and Saturn together in the evening sky.
Aliens at Proxima Centauri? A New Radio Signal Raises the Question
Extraordinary claims require extraordinary evidence, so here are the reasons why there may or may not be aliens in our cosmic backyard.
Your guide to future total solar eclipses
Bruce Betts and Sarah Al-Ahmed provided a guide to all total solar eclipses through the end of the 2020s, with dates and locations.