Following the excitement generated by the Galileo spacecraft's first Ganymede flyby on 27 June, researchers are hoping that data from the 6 September encore performance—which skimmed within 262 km of that Jovian moon—will help them understand why Ganymede is more tectonically and magnetically active than expected. The data trickling back to Earth during the next two months is expected to include the best images yet obtained (some stereoscopic) of Jupiter's and the Solar System's largest moon.