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.

Your Guide to Mercury

Mercury, the innermost planet, can teach us how the planets formed and what the early solar system was like when life arose on Earth.

Your Guide to Venus

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.

Your Guide to the Moon

The Moon is the only world besides Earth ever visited by humans. By studying it, scientists can piece together Earth’s origin story.

Your Guide to Mars

Mars, the Red Planet, 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

There are countless asteroids, comets, and small worlds in our solar system to explore besides the planets.

Your Guide to Jupiter

Jupiter, our largest planet, teaches us how solar systems evolve. Its four planet-like moons make it a solar system of its own.

Your Guide to Saturn

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

Uranus may be the butt of many jokes, but there's more to this ice giant than meets the eye.

Neptune

Chilly Neptune has winds that travel faster than the speed of sound on Earth.

Your Guide to Exoplanets

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.

Latest Articles

How to Pick the Perfect Beginner Telescope

Picking out your first telescope can be overwhelming. This easy-to-follow guide will help you find an affordable telescope that you'll actually use.

What Is a Solar Eclipse? Your Questions Answered.

Your guide to total, partial, and annular eclipses: what causes them, what you'll see, and when the next one will happen.

Sample Return Roundup

It's a banner year for sample return missions. In 2020, China, Japan, and the United States are all scheduled to have sample return missions in flight, seeking to retrieve material from near-Earth asteroids, the Moon, and eventually Mars.

Our New Map of Every Mars Landing Attempt, Ever

The Planetary Society has a new improved guide to all the places we've landed—or crashed—on Mars, plus planned locations for the upcoming Perseverance, Tianwen-1, and Rosalind Franklin rover missions.

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