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

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.

Brighten up your day

JWST captures more astonishing images and insights, and DART gets ready for impact.

Earthlings off-planet

Celebrate 61 years of humans in space, and take a look at the latest news from our exploration of the cosmos.

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