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http://www.bbc.co.uk/news/science-environment-13378864
12 May 2011 Last updated at 18:17 GMT
Jupiter moon 'holds magma ocean'
By Jonathan Amos
Science correspondent, BBC News
The moon of Jupiter erupts about 100 times more lava on to its surface each year than does Earth.
A re-assessment of data from Nasa's Galileo probe suggests all this activity is being fed from a giant magma ocean under Io's crust.
Researchers tell Science magazine that this blisteringly hot reservoir is probably some 50km (30 miles) thick.,,,more from the source
12 May 2011 Last updated at 18:17 GMT
Jupiter moon 'holds magma ocean'
By Jonathan Amos
Science correspondent, BBC News
The moon of Jupiter erupts about 100 times more lava on to its surface each year than does Earth.
A re-assessment of data from Nasa's Galileo probe suggests all this activity is being fed from a giant magma ocean under Io's crust.
Researchers tell Science magazine that this blisteringly hot reservoir is probably some 50km (30 miles) thick.,,,more from the source