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

How long is a day on Saturn?

One of the Cassini mission's goals was to figure out how long a day on Saturn is. We still don't know. A new paper reports a measurement of the rotation period of Saturn that is different from past measurements.

Fall 2017 issue of The Planetary Report now available

The Fall 2017 issue of The Planetary Report is in the mail and available online now to our members!

Cassini's 'Grand Finale' Portrait of Saturn

Amateur image processor Ian Regan shares a stunning mosaic of Saturn in all its ringed glory.

Amazing photos of tiny moons as Cassini orbits among the rings

Behold: Daphnis, the tiny, 8-kilometer moon that orbits within a ring gap, gently tugging on the edges of the gap to create delicate scallops.

Saturn's Ring Particles

Artist and astrophotographer Judy Schmidt brings us a view from within the rings of Saturn.

Serene Saturn (or the “Glutton for Punishment” mosaic)

A week ago Saturday I decided -- against my better judgment -- to tackle this monster of a mosaic. I call it the

Three bright planets: Portraits from the Pyrenees

It's a great time to go outdoors and look at planets. I have three glorious planetary portraits to share today, sent to me by amateur astronomer Jean-Luc Dauvergne.

Watch the entire Cassini mission image catalog as a movie

If you were to download the entire catalog of photos taken at Saturn to date by Cassini and then animate them like a flipbook, how long would it take to watch them all pass by? The Wall Street Journal's Visual Correspondent Jon Keegan has your answer: nearly four hours.

A few gems from the latest Cassini image data release

I checked out the latest public image release from Cassini and found an awesome panorama across Saturn's rings, as well as some pretty views looking over Titan's north pole.

Prometheus, Pandora, and the braided F ring in motion

Cassini recently took a long, high-resolution movie of the F ring, catching a view of its ringlets, clumps, and streamers, and two potato-shaped moons, Prometheus and Pandora.

A Sky Full of Stars

In pictures of the planets, the stars aren't usually visible. But when they do appear, they're spectacular.

A (Difficult) Day in the Solar System

After a bad day on the launch pad, some perspective.

On the masses and motions of mini-moons: Pandora's not a "shepherd," but Prometheus still is

As Cassini celebrates 10 years at Saturn, we're beginning to see its long-term observations of Saturnian moons bear fruit. A surprising new result: While Prometheus exerts control over the F ring and Atlas, Pandora -- long thought to be a shepherd of the F ring -- does not.

Of Rings and Resolution

Seeing Saturn before and after Cassini.

Another Pale Blue Dot — Uranus Spied By Cassini

The Cassini mission has already returned an array of images of other solar system members from Saturn orbit: Earth (and the Moon), Venus, Mars, and Jupiter. It’s time to add another world to that list!

Dancing With Saturn

Cassini images in motion.

A little fun with Cassini rings images

It's happened again; I went into the Cassini image archive looking for something specific and wound up spending several hours playing with totally unrelated image data. Here are several beautiful images of the rings from the archives.

Just what is going on in that magnificent Cassini image of Saturn?

It took months of work (and no wonder) but the wait was worth it: here is Cassini's spectacular view of Saturn, captured on July 19, 2013, as Cassini passed through Saturn's shadow. If you're a little confused by the image, I'm here to help: I've posted a video explainer.

Will We Lose Cassini’s "New" Mission at Saturn to Budget Cuts?

NASA’s shrinking budgets for planetary exploration may force it to decide between continued funding for the Saturn Cassini mission and the continued funding for its Mars missions.

One for the history books: Stunning Saturn mosaic captured last week by Cassini

I try to be measured in my praise for spacecraft images. Not every photo can be the greatest space image ever. But this enormous mosaic showing the flattened globe of Saturn floating within the complete disk of its rings must surely be counted among the great images of the Cassini mission.

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