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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.

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.

Seizing upon syzygy

How scientists use total solar eclipses as opportunities to do solar science.

How to host an eclipse party

Hosting a solar eclipse-watching party is a fantastic way to share one of nature’s most awe-inspiring events with your friends and family. Here’s a guide to hosting a safe and memorable eclipse-watching party.

Become an Eclipse Explorer!

In anticipation of the total solar eclipse on April 8, 2024, The Planetary Society has partnered with the National Park Service to launch a new Eclipse Explorer Junior Ranger booklet.

What went wrong with Mars Sample Return

An edited transcript of an interview with Orlando Figueroa, chair of the independent review team that evaluated NASA's Mars Sample Return program.

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.

Sharing an eclipse with kids

Here's a simple and safe way to observe solar eclipses that's appropriate for young children, with no eclipse glasses or other special equipment needed.

How do we see the surface of Venus from space?

Although Venus is shrouded in a thick atmosphere, several spacecraft have been able to image its surface from space. Future missions will expand and refine the maps we already have.

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