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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.

Way out there

We’re always learning more about the worlds of the outer Solar System, and even those beyond.

Rocket flight and the five dwarfs

Meet the Solar System’s five official dwarf planets, celebrate two major launches, and find out why planets sometimes seem to go backwards across the sky.

Extraterrestrial frosts

Frost happens throughout the Solar System, creating beautiful views. Learn why and check out the latest in space news.

Jupiter dazzles and Neptune beckons

Feast your eyes on these images from space, catch up on the latest in exploration news, and get the lowdown on what’s up in the night sky.

NASA Then & Now

A collection of before and after slider images showing how views of planets in our solar system have changed over the years since NASA was created.

Sketching a science meeting

The Planetary Society has always enjoyed the connections between science and art, so when I saw Leila Qışın's sketches pop up on her Twitter feed during the recent New Horizons team meeting, I knew I had to share them with you.

Some big moons in the Kuiper belt

In a new preprint, Mike Brown and Bryan Butler show evidence that two Kuiper belt moons are even bigger than we used to think. They are Eris' moon Dysnomia, and Orcus' moon Vanth.

Pluto is not the end

One year after the New Horizons Pluto flyby, Emily reflects on its significance.

New Horizons Science Team Meeting Report

On July 6 at Lowell Observatory in Flagstaff, Arizona, the science team convened at the place where Pluto was discovered. Ted Stryk reports from the meeting.

Clouds and haze and dust, oh my!

What types of aerosols do we find in the atmospheres around the Solar System, and why does what we call them—clouds vs. haze vs. dust—matter? Sarah Hörst explains.

Pluto updates from AGU and DPS: Pretty pictures from a confusing world

Pluto is reluctant to give up its secrets. Last week at the American Geophysical Union meeting I attended sessions featuring results from the New Horizons mission, and most of the presentations could be summed up thusly: the data sets are terrific, but there are still a lot of Pluto features that have scientists scratching their heads.

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