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Callisto (astronomy)
(redirected from Callisto (moon))

    Also found in: Wikipedia 0.04 sec.

Callisto

Second-largest moon of the planet Jupiter, 4,800 km/3,000 mi in diameter, orbiting every 16.7 days at a distance of 1.9 million km/1.2 million mi. Its surface is covered with large craters.

The US space probe Galileo detected oxygen on Callisto in 1997, suggesting that its surface material contains a high proportion of water ice. In 1998 Galileo's magnetometer measured electrical currents near Callisto's surface that are consistent with the existence of a buried salty ocean beneath the icy crust.



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