Feeds

Phoebe's past writ large in craters

Saturn's moon shows its age

  • alert
  • submit to reddit

Secure remote control for conventional and virtual desktops

Those craters in detailPhotographs from Cassini's flyby of Saturn's moon Phoebe have revealed a battered body, with an interesting past. Its face is pock-marked with craters ranging from 80 kilometers across to less than one kilometer, with variations in colour suggesting it contains plenty of ice.

The larger impact sites have prompted speculation that collisions in Phoebe's past could have blasted off enough material to have formed Saturn's smaller retrograde moons.

The brighter craters are most likely the newer impacts. Each collision would have blasted off surface material, and exposed brighter material, possibly ice, below the surface. There is more evidence for this theory on the crater walls: darker material seems to have slid down slope, exposing more light-colored material.

"What we are seeing is very neat. Phoebe is a heavily cratered body. We might be seeing one of the chunks from the formation of the solar system, 4.5 billion years ago. It's too soon to say," said Dr. Torrence Johnson, from NASA's Jet Propulsion Laboratory. "It's important to see the big picture from all of the other instruments to get the global view on this tiny moon."

All 11 of Cassini's instruments were pointed at the moon as the spacecraft flew by, just over 2000km above the surface. The data will be analysed over the next few days and will help scientists to build global maps of the moon, and to determine its composition, mass and density. ®

Related stories

Mysterious Phoebe: Cassini's next fly-by
Cassini images delight star gazers
Comet chasers seek secret of life

Secure remote control for conventional and virtual desktops

More from The Register

next story
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
Thought that last dinosaur was BIG? This one's bloody ENORMOUS
Weighed several adult elephants, contend boffins
Europe prepares to INVADE comet: Rosetta landing site chosen
No word yet on whether backup site is labelled 'K'
India's MOM Mars mission makes final course correction
Mangalyaan probe will feel the burn of orbital insertion on September 24th
City hidden beneath England's Stonehenge had HUMAN ABATTOIR. And a pub
Boozed-up ancients drank beer before tearing corpses apart
'Duck face' selfie in SPAAAACE: Rosetta's snap with bird comet
Probe prepares to make first landing on fast-moving rock
Archaeologists and robots on hunt for more Antikythera pieces
How much of the world's oldest computer can they find?
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.
Security and trust: The backbone of doing business over the internet
Explores the current state of website security and the contributions Symantec is making to help organizations protect critical data and build trust with customers.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.