Jupiter's odd bunch

摘要

Picture four strange worlds, siblings in space. On one, a giant volcano has just spattered a region the size of England with bright yellow debris. This world glows with a ghostly light, given off by its shroud of ionised gases. The second world is covered in a shell of ice, but hiding beneath could be a warm ocean that could shelter exotic life forms. The third, a seemingly calmer globe, conceals a turbulent interior that whips up huge magnetic fields. But the fourth is an unchanging land, which has been dead and cold for billions of years.