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

What are asteroids made of?

C-type, S-type, and M-type are the three most common kinds of asteroids. Here's what each type is made of.

Far from alone

How exoplanet discoveries reshape the prospect of alien life.

What are planets made of?

A look at the compositions of terrestrial planets, gas giants, and ice giants in our Solar System.

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.

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.

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.

The best of 2023

The results are in for the Best of 2023! People around the world voted, and here are the winning space images, missions, exploration milestones, and more.

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