澳门新永利官方网站:Cannibalistic Jupiter ate its early moons

 作者:独孤阏骈     |      日期:2019-03-09 02:10:01
By Marcus Chown THE four giant “Galilean” moons orbiting Jupiter are the last survivors of at least five generations of moons that once circled the gas giant. “All the other moons – and there could have been 20 or more – were devoured by the planet in the early days of the solar system,” says Robin Canup of the Southwest Research Institute in Boulder, Colorado. The four Galilean moons have played a key role in the history of science – their discovery by Galileo 400 years ago provided irrefutable evidence that not all bodies orbited the Earth. But until recently,