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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. |
Callisto| In Greek mythology, a nymph beloved by Zeus who was changed into a bear by his jealous wife Hera. |
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