Moving mountain

时间:2019-03-07 01:15:05166网络整理admin

THE mystery of a volcano on Jupiter’s moon Io that appeared to have moved has been solved. In October, the Galileo spacecraft took pictures of a volcano named Prometheus, which seemed to be 75 kilometres from where it was discovered by the Voyager spacecraft 17 years ago. “Volcanoes don’t do that on Earth,” says Rosaly Lopes-Gautier of NASA’s Jet Propulsion Laboratory in Pasadena. But at a meeting in Pasadena last week, Lopes-Gautier explained how Galileo’s images show that the apparent motion of the volcano was caused when volcanic debris flowed over a field of sulphur dioxide “snow” 75 kilometres away. “It hits the reservoir of sulphur dioxide and creates a new plume,