ALL EYES ON IO
As Americans marvel over Alien and Star Trek: The Motion Picture, Voyager 1 beams back pictures stranger than science fiction. On Io, Jupiter's moon, researchers had expected to find craters but instead saw a tormented landscape of calderas and volcanic vents. It was a stunning find: Earth was not the only planetary body with an active interior. Io has lakes of molten sulfur and plumes of sulfur dioxide shooting hundreds of kilometers above the surface.