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

What are planets made of?

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

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.

What does “Mercury in retrograde” actually mean?

"Mercury in retrograde" is one of the most searched terms relating to the planet. Astrological interpretations aside, apparent retrograde motion is an interesting phenomenon that has to do with orbital speeds and observer perspective.

Red hot space

This week’s roundup of space news and exploration inspiration will leave you seeing red (in the best way possible).

Planetary accessorizing

Planets are beautiful and fascinating enough on their own, but there’s no denying that moons and rings add a little something special.

Rocky worlds rock

This week we're all about the rocky planets: Mercury, Venus, Earth and Mars.

Solar System History 101

How did our solar system come to be? Why are the planets, asteroids, comets, and other small worlds where they are now?

The Next 10 Years

Six scientists share the major planetary science discoveries of the past decade, and the questions that will drive the next 10 years of solar system exploration.

How to follow BepiColombo's launch

I’m thrilled to be anticipating the beginning of a new mission to Mercury. Here's a timeline for BepiColombo's planned launch on 20 October (19 October in the U.S.).

Voyage to Mercury

Elsa Montagnon details the challenges of delivering BepiColombo’s two spacecraft from Earth to Mercury.

Planetary discovery over the past quarter century

2016 marks the 25th anniversary of the creation of what has become one of the primary venues for the publication of research in planetary science: the Journal of Geophysical Research: Planets. This occasion is a good opportunity to look back at what we have learned in this era of expanded exploration and to try to take a peek at the future.

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