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

Uranus' biggest unsolved mysteries

Distant, icy Uranus has puzzled scientists for decades. From its sideways spin to its mysterious magnetic field, the oddball world has many secrets waiting to be revealed.

How did Earth get its water?

Earth's water may have been on our planet since its formation, or could have been brought here by impactors early in our planet's history. Here's a look at the leading theories about where Earth's water came from.

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