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Small BodiesStories, 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.
An exquisite cosmic coincidence
Why eclipses on Earth are unlike anything else in the Solar System.
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.
What is Venus' quasi-moon Zoozve?
The story behind the newly-named quasi-satellite of Venus.
The best places to search for life in our Solar System
From Earth's neighboring planets to distant moons, these are the best places to look for alien life.
The coolest moons of Jupiter and Saturn you’ve never heard of
Meet the lesser-known moons of our Solar System's gas giants.
Asteroids vs comets vs meteorites/meteoroids/meteors
A handy guide to help tease apart the differences between asteroids, comets, meteors, meteorites, and meteoroids. e
What is a planetary conjunction?
An explainer on planetary conjunctions, and what it means when a planet is at conjunction or at opposition.
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.
What are Jupiter’s Galilean moons?
An introduction to Jupiter's moons Io, Europa, Ganymede, and Callisto.
Looking for long waves
Why JWST observes in the infrared.
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.
How old is the Earth?
The Earth is thought to be about 4.54 billion years old. Learn more about how it formed, and how we know when this all happened.
Lucy’s flyby of Dinkinesh: Everything you need to know
On Nov. 1, 2023, NASA’s Lucy spacecraft flew past Dinkinesh, a small asteroid in the main belt, and discovered a binary pair of moonlets in orbit around the asteroid.
Why aren't there more close-up images of Uranus and Neptune?
There aren't many close-up, high-resolution images of the ice giants Uranus and Neptune. The reason comes down to distance.
How do humans try to communicate with aliens?
SETI is the search for extraterrestrial intelligence, using various techniques to look for signals from advanced alien civilizations. METI (messaging extraterrestrial intelligence) is when we send out our own signals for aliens to find.
Why partial eclipses are worth seeing
Partial eclipses are the most common solar eclipse to see. Here's why that is, and why it's worth going out and (safely) looking up.
What is an annular solar eclipse?
An overview of annular solar eclipses, how they work, what they're like to experience, and how to view one safely.
A guide to eclipse vocabulary
A list of useful words and terms relating to lunar and solar eclipses.
Are your solar eclipse glasses safe?
A guide to how to make sure your solar eclipse glasses are safe and certified, plus tips on what to do — and what not to do — if you want to experience an eclipse without glasses.