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

Not a Heart of Ice

Mark Marley explains what planetary scientists mean when they say the word

DPS 2015: Solar System Formation

At the 47th Division of Planetary Systems meeting, many presentations touched on some of the most contentious and poorly known aspects of how planets form.

Favorite Astro Plots #2: Condensation of the solar system

Behold: the story of how our solar system began, in one chart. This is the second installment in a series of planetary scientists' favorite plots. Today's #FaveAstroPlot was suggested by spectroscopist Michael Bramble.

How Weird Is Our Solar System?

Earth and its solar system compatriots all have nearly circular orbits, but many exoplanets orbit their stars on wildly eccentric paths. Is our home system strange? Or is our sense of the data skewed?

The Birth of the Wanderers

How did planets originate? This is a question that has puzzled scientists for centuries, but one which they have been able to tackle directly only in the last few decades, thanks to two major developments: breakthroughs in telescope technology and ever-increasing computing power.

A second Sedna! What does it mean?

2012 VP113 is a new world that has been discovered on a Sedna-like orbit. What does that mean? It could imply the existence of a planet X, but doesn't prove it. It does suggest that a lot more Sednas are waiting to be discovered.

Cosmos with Cosmos Episode 9: The Lives of the Stars

This episode highlights the other big idea in Cosmos: that we are profoundly connected with the universe around us. Our constituent parts are forged in the bellies of massive stars; we exist through their deaths.

Iapetus' peerless equatorial ridge

A new paper in the Journal of Geophysical Research - Planets by Dombard, Cheng, McKinnon, and KayI claims to explain how Iapetus' equatorial ridge formed. Cool!

Space is vast. There's a lot of exploring to do.

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