Planets and moons change size all the time, whether by attracting mass, shrinking in volume, or spewing their insides out of volcanoes.

Long-exposure photography can help see dim, distant light sources. It can also show us familiar lights in totally new ways.

Our rovers and astronauts leave tracks where they explore. But there’s always the possibility that those tracks — and even entire missions — could be erased.

NASA’s science budget is facing historic cuts, and advocates like you need to speak up. Jupiter has its own turbulence, too, but to learn more about it, we’ll need to fund NASA.

Proposed NASA cuts would cancel dozens of space missions — including spacecraft already paid for, launched, and making discoveries.

The conditions for intelligent life to arise don't seem uncommon in the Cosmos. So where is everybody?

Space telescopes teach us so much about the Solar System and beyond. It’s crucial that we keep funding them.

NASA science faces record cuts. Take action to stop it—we'll show you how.

How a message to aliens captured the human spirit.

When we explore space, we make discoveries — about never-before-seen asteroids, unusual exoplanets, and even our own planet. But to find out new things, we have to continue seeking.

The Planetary Society celebrates 45 years of advocating for space science and exploration.

If dimethyl-sulfide truly exists on the planet K2-18 b, it could be a huge milestone in the search for life.

The Planetary Society is speaking out against a threat to NASA’s science programs. We need your help to prevent a dark age of exploration.

Comets, moons, tiny twisters, and blueberries — they may be small, but they’re far from insignificant.

Catch this spectacular comet over the next few weeks.

From long-exposure photography to color gradients, scientists and artists can sometimes draw from the same toolbox.

When dust and rock come together, they form planets and moons. When people come together, we make a difference.

On March 24, 2025, The Planetary Society’s annual Day of Action brought more people than ever before to Washington, D.C., to advocate for space.

More planets and moons are being discovered all the time. It’s up to us to explore them.

Something weird is happening — something that, even as an astronomer, I once struggled to explain.