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.

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.

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 Worlds

These leftover planet-building materials are like time capsules that give us a peek into our origins.

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.

Your Guide to Uranus

Uranus may be the butt of all planet jokes, but there's much more to this world than potty humor.

Your Guide to Neptune

Neptune, our outermost planet, is a windy blue world with exotic ice, raging storms, rings, and a moon that could have a subsurface ocean.

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

Cassini Captures Its First Image of Saturn

The Cassini spacecraft has captured its first image of its target planet, Saturn.

Voyager's Last View

Home. Family. This will be Voyager's enduring legacy: It has changed forever the feelings raised by those words. Through its robotic eyes we have learned to see the solar system as our home. Through its portraits of the planets we know that they are part of our family. Apollo astronauts showed us a tiny Earth alone in the blackness of space. Now, with these images, Voyager has shown us that Earth is not really alone. Around our parent Sun orbit sibling worlds, companions as we travel through the Galaxy.

The Devon Diaries

Emily Lakdawalla reports on her expedition to Devon Island, where The Planetary Society is taking steps toward the goal of humans and robots working together to explore Mars.

Haughton Impact Crater

Haughton Crater measures about 20 kilometers (12.4 miles) in diameter, and was formed 23 million years ago when either an asteroid or a comet collided with our planet.

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