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

Is Europa's ice thin or thick? At chaos terrain, it's both!

Among Europa scientists there are two warring factions: the thick-icers and the thin-icers. The question is how thick is the ice shell that overlies Europa's subsurface ocean (the existence of which pretty much everyone agrees on).

Door 14 in the 2010 advent calendar

Until the New Year, I'll be opening a door each day onto a different landscape from somewhere in the solar system. Where in the solar system are these red freckles?

Door 3 in the 2010 advent calendar

Time to open the third door in the advent calendar. Until the New Year, I'll be opening a door onto a different landscape from somewhere in the solar system. Where in the solar system is this wispy terrain?

Exposing Io's true colors

Thanks to its active volcanic activity and sulfur-rich surface, Io is one of the most colorful worlds yet seen in the Solar System, save the Earth of course

Volcanism across the solar system: Io

Three months ago, grandiosely, I announced that I was going to survey volcanism across the solar system, and I began the journey on Earth. Then I failed to follow up.

Four hundred and fourteen years since Galileo

Galileo, the scientist, discovered the Galilean satellites of Jupiter four hundred years ago next month, while Galileo, the mission, arrived at Jupiter to study those moons in situ fourteen years ago Sunday.

Aloha, Io

Taking a look at Jupiter's moon, Io, from Hawaii.

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