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.
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
How did our solar system come to be? Why are the planets, asteroids, comets, and other small worlds where they are now?
China plans to select one of two Jupiter mission concepts that would launch in 2029 and arrive in 2035.
There's still time to get outside and see Jupiter and Saturn together in the evening sky.
Extraordinary claims require extraordinary evidence, so here are the reasons why there may or may not be aliens in our cosmic backyard.