The Galileo spacecraft's first flyby of Ganymede shows that the Jovian moon has much more rugged terrain than expected, and probably has a magnetic field that most scientists had previously discounted. The catch from the June 27 flyby is still being returned, and it upsets concepts that scientists had formulated from prior data including Voyager imagery. Galileo's closer 844-km. (525-mi.) range produced images with up to 70-140 times finer resolution. ``This is not even 1% ...
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