Feeds

Phoebe's past writ large in craters

Saturn's moon shows its age

  • alert
  • submit to reddit

Top three mobile application threats

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

3 Big data security analytics techniques

More from The Register

next story
Red-faced LOHAN team 'fesses up in blown SPEARS fuse fiasco
Standing in the corner, big pointy 'D' hats
KILLER SPONGES menacing California coastline
Surfers are safe, crustaceans less so
Opportunity selfie: Martian winds have given the spunky ol' rover a spring cleaning
Power levels up 70 per cent as the rover keeps on truckin'
Liftoff! SpaceX Falcon 9 lifts Dragon on third resupply mission to ISS
SpaceX snaps smartly into one-second launch window
KILLER ROBOTS, DNA TAMPERING and PEEPING CYBORGS: the future looks bright!
Americans optimistic about technology despite being afraid of EVERYTHING
Discovery time for 200m WONDER MATERIALS shaved from 4 MILLENNIA... to 4 years
Alloy, Alloy: Boffins in speed-classification breakthrough
Elon Musk's LEAKY THRUSTER gas stalls Space Station supply run
Helium seeps from Falcon 9 first stage, delays new legs for NASA robonaut
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.