Feeds

Jupiter's Io a hotbed of lava

Moon's OCEAN of MAGMA drives spectacular volcanism

Top three mobile application threats

Scientists perusing data from NASA's Galileo spacecraft have concluded that the spectacular volcanism displayed by Jupiter's moon Io is caused by a substantial subsurface magma ocean.

A team from the University of California and the University of Michigan looked at "unexplained signatures [which] appeared in magnetic field data from Galileo flybys of Io in October 1999 and February 2000".

These signatures suggested the presence of "ultramafic" igneous rocks, which are "capable of carrying substantial electrical current when melted". NASA explains: "Tests showed that the signatures detected by Galileo were consistent with a rock such as lherzolite, an igneous rock rich in silicates of magnesium and iron found in Spitzbergen, Norway."

The scientists have estimated that Io's magma ocean is some 50km (30 miles) thick, and bubbling away at a temperature above 1,200°C. Its presence under a low-density crust of around 30 to 50km (20 to 30 miles) explains why the moon's volcanoes are dotted all over its surface, rather than in "localised hotspots" as happens at the boundaries of Earth's tectonic plates.

NASA image of Io

Torrence Johnson, a former Galileo project scientist, said of Io's hotbed of lava: "It has been suggested that both the Earth and its moon may have had similar magma oceans billions of years ago at the time of their formation, but they have long since cooled.

"Io's volcanism informs us how volcanoes work and provides a window in time to styles of volcanic activity that may have occurred on the Earth and moon during their earliest history," Johnson said.

The findings are published in this week's Science (subscription required for the full-fat article). ®

High performance access to file storage

More from The Register

next story
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'
LOHAN and the amazing technicolor spaceplane
Our Vulture 2 livery is wrapped, and it's les noix du mutt
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
R.I.P. LADEE: Probe smashes into lunar surface at 3,600mph
Swan dive signs off successful science mission
Discovery time for 200m WONDER MATERIALS shaved from 4 MILLENNIA... to 4 years
Alloy, Alloy: Boffins in speed-classification breakthrough
prev story

Whitepapers

SANS - Survey on application security programs
In this whitepaper learn about the state of application security programs and practices of 488 surveyed respondents, and discover how mature and effective these programs are.
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.
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.
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.