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

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.

Transits are cool, but…

A moon transiting the Sun is awesome, but still doesn’t quite compare to a total solar eclipse. Learn why, find out about Europa Clipper’s message in a bottle, and more.

Seizing upon syzygy

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

Science to satisfy curiosity

The Curiosity rover is climbing a mountain to gain knowledge. Bringing back Mars samples will gain us even more.

Lunar success stories

The Odysseus spacecraft marks the return of U.S. landers to the Moon. JAXA wants you to help name an asteroid. And we’re speaking up for your place in space.

A ridge over hidden water

Ridges on Mars and Europa hint at past and present water. Distant dwarf planets are unexpectedly warm. And we’re working hard to help find life.

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.

Far from predictable

Some things, like solar cycles, are hard to predict. Others, like Zoozve taking the world by storm, are even more unpredictable.

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.

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