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

Voyager Wide-Angle Views of Jupiter

Last month marked the 40th anniversary of the historic Voyager 1 encounter with Jupiter in 1979.

Moon Monday: Galileo's Galileans

This week it seems fitting to feature a portrait of the Galilean moons by Galileo.

#LPSC2018: Groovy Galilean satellites

The Jovian system is a busy place. The Groovy Galilean Satellites session at last week's Lunar and Planetary Science Conference (LPSC) covered analysis of past mission data, testable hypotheses for future missions, and discussion of the use of ground-based data.

Will Juno’s Instruments Observe the Moons of Jupiter?

It is not easy to observe Jupiter’s moons as more than points of light with Juno, because Juno will never get very close to any of the moons, but as its orbit shifts there will be opportunities to collect data on some of the moons.

Juno has arrived!

For a second time, NASA has placed a spacecraft into orbit at Jupiter. The spacecraft operated exactly according to plan, and Juno successfully entered orbit today, July 5, 2016, UTC

A peek at the JunoCam approach movie

We're now just about 12 hours away from Juno's Jupiter orbit insertion. As anticipation ramps up, NASA has released this sneak peek at JunoCam's approach movie, made of views of Jupiter and its largest moons shot during the final approach, up until about five days ago.

A moon with atmosphere

What is the solar system moon with the densest atmosphere? Most space fans know that the answer is Titan. A few of you might know that Triton's is the next densest. But what's the third? Fourth? Do any other moons even have atmospheres? In fact, they do; and one such atmosphere has just been discovered.

JUICE at Europa

Europe's JUICE spacecraft will provide us with a detailed regional study of this icy moon of Jupiter.

Scale comparisons of the solar system's major moons

A few presentation slides with pretty pictures, sized to scale, of the large moons of the solar system.

One Ocean World Among Many

I'm absolutely floored when I stop to think that our beautiful blue ocean is only one of perhaps a half dozen or more oceans on other worlds in our solar system, and only one of probably millions (or more) oceans on other Earth-like planets in our galaxy. Oceans abound!

Instruments for the JUICE Jovian Mission

The European Space Agency (ESA) announced the list of instruments selected for its JUICE mission to explore the Jovian system for three years starting in the 2030 following a 2022 launch.

Book Review: Atlas of the Galilean Satellites, by Paul Schenk

Not many subjects remain for which it is possible to assemble everything that we know about it in one book. Even for those subjects for which our knowledge is limited, knowledge seems always to be expanding exponentially. This is not true, however, for the Galilean satellites of Jupiter.

Scale solar system presentation slide, a provisional version for you to review

I'm preparing a talk for the Pacific Astronomy and Telescope Show here in Pasadena on Sunday afternoon at 1:45. I have spent the morning putting together a slide that I have long wanted to have for presentations.

Update: Phobos and Jupiter and its moons!

Remember that neat picture and movie of Phobos passing by Jupiter that I posted last week? Several people asked me where Jupiter's moons were, and I just assumed that they weren't visible. I was wrong; Mars Express spotted Jupiter's moons along with the planet and Mars' moon!

Spotting Jupiter's Moons...with a Solar Telescope!?

I was astounded to learn this morning that SOHO can not only see Jupiter, it can actually resolve Jupiter's moons (at least its two outer ones) as points of light separate from their planet!

Mercury: a moon-scale body

As I wait for the MESSENGER Mercury Orbit Insertion webcast to start, I thought I'd fiddle with some images to point out that Mercury is a bridge between the scales of planets and the scales of moons.

Door 22 in the 2010 advent calendar

Time to open the twenty-second door in the advent calendar. Where in the solar system are these degraded craters?

A new view of Callisto

Here's a lovely amateur-produced color image of Jupiter's moon Callisto, or, as its artist Daniel Macháček calls it,

Titan: Callisto with weather

It's the second time I've posted with this provocative title. This time, it's in response to a new paper published last week in Science.

LPSC: Why Ganymede and Callisto are so different

The first talk I attended at the Lunar and Planetary Science Conference in Houston was my one icy satellite talk for the day.

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