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Stories, updates, insights, and original analysis from The Planetary Society.

Volcanoes are so hot right now

From Mars to Io, volcanoes top the list of hottest things in space right now — both literally and figuratively.

What are planets made of?

A look at the compositions of terrestrial planets, gas giants, and ice giants in our Solar System.

Scratching the surface

The latest news on missions to search for ice and water beneath planetary surfaces.

A sight to remember

For hundreds of millions of people, the Sun and Moon put on an astonishing show this week. Here are our eclipse highlights and more.

How do NASA and ESA work together?

NASA and the European Space Agency (ESA) have a long-standing partnership that has resulted in spectacular science missions, including the James Webb Space Telescope and the Cassini-Huygens mission to Saturn.

Is Planet X/Planet Nine real?

Planet X and Planet Nine are planets that have, at one time or another, been thought to exist in our Solar System. Both were hypothesized to explain the orbital characteristics of smaller outer Solar System bodies.

Keeping an eye on things

Measuring changes in the Moon’s size, watching for eruptions on the Sun’s surface, and monitoring budget developments.

Is the Moon shrinking?

The Moon is shrinking in both actual volume and its apparent size from Earth’s perspective. We explain how scientists know this, why it happens, and how it might affect Earth.

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