Io Aurora . ... Credit Copyright: Galileo Project , University Of Arizona (PIRL) , JPL , NASA Explanation: Alluring aurora surrounding Io (eye-oh) appear as a ghostly glow while the volcanic moon orbits within Jupiter's dark shadow. Gas giant Jupiter is off to the right of this image, recorded in May by the robot Galileo spacecraft's solid state imaging camera from a distance of about 1.3 million kilometers. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...