On which planets have scientists seen auroras ?
[[ Image:Saturns Northern Aurora still.jpg | thumb | An aurora high above the northern part of Saturn ; image taken by the Cassini spacecraft , a movie ( click on image ) , shows images from 81 hours of observations of Saturn 's aurora ]] Both Jupiter and Saturn have magnetic fields much stronger than Earth 's ( Jupiter 's equatorial field strength is 4.3 gauss , compared to 0.3 gauss for Earth ) , and both have large radiation belts .