Feeds

Dione and Tethys pose for Cassini

Saturn's rings also make an appearance

Top 5 reasons to deploy VMware with Tegile

Cassini has snapped some stunning shots on its meanderings through the Saturnian system, but this one is a corker, even by its high standards.

The image, courtesy of NASA's JPL, shows the moons Dione and Tethys facing each other across Saturn's rings, Dione in the foreground some 860,000km from Cassini. Tethys is a further 640,000km distant.

Dione, Tethys and the Cassini Division

The picture was taken in natural light using Cassini's narrow angle camera on 22 September this year.

Dione and Tethys were discovered in 1684 by Giovanni Cassini. The larger of the two moons, Dione is 1,126km across and is the densest moon of Saturn after Titan. It is thought to be mainly water ice around a rocky core.

Its surface is heavily cratered in places, mostly on its trailing hemisphere - the side facing away from its direction of motion, contrary to scientists expectations. Researchers now think the moon used to spin in the other direction, but was hit by an impactor big enough to change that over.

Tethys is not much smaller, measuring 1,071km in diameter. Scientists think it is composed almost entirely of water ice, and that the cracks across its surface were caused by its liquid interior welling up through the frozen crust. ®

Beginner's guide to SSL certificates

More from The Register

next story
PORTAL TO ELSEWHERE scried in small galaxy far, far away
Supermassive black hole dominates titchy star formation
Boffins say they've got Lithium batteries the wrong way around
Surprises at the nano-scale mean our ideas about how they charge could be all wrong
Edge Research Lab to tackle chilly LOHAN's final test flight
Our US allies to probe potential Vulture 2 servo freeze
Europe prepares to INVADE comet: Rosetta landing site chosen
No word yet on whether backup site is labelled 'K'
Cracked it - Vulture 2 power podule fires servos for 4 HOURS
Pixhawk avionics juice issue sorted, onwards to Spaceport America
prev story

Whitepapers

Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.