Most of the Solar System’s volcanoes are dead — but not all of them. NASA’s budget is still in trouble, but people are speaking up.

The Planetary Society is proud to announce the newest recipient of the Cosmos Award for Outstanding Public Presentation of Science, author Dava Sobel.

The Sun’s activity is peaking, while NASA’s budget is facing historic lows.

How other worlds experience auroras.

How advanced amateurs defend Earth from asteroids.

A photographer’s guide to auroras.

The magnetism behind spectacular phenomena.

How a grassroots movement sailed on sunlight.

How a spacecraft is able to touch the Sun.

The White House has put forward a radical, wasteful proposal for NASA. We have the data to prove it.

NASA’s budget is officially in grave danger, but there are things you can do to help.

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

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