PLANETARY SCIENCE:
Fiery Io Models Earth's First Days
Richard A. Kerr
HOUSTON--Using sophisticated instruments aboard the Galileo spacecraft orbiting Jupiter, researchers reported last month at the annual Lunar and Planetary Science Conference here that they have observed a surface temperature of about 1800 kelvins on Jupiter's moon Io, the most volcanically active body known. Planetary geologists say that these high temperatures imply a type of volcanism not seen on Earth for billions of years, meaning that scientists can use Io as a volcanological laboratory to test models of terrestrial volcanism.