HUBBLE-SPACE-TELESCOPE IMAGING OF NEPTUNE CLOUD STRUCTURE IN 1994

Images of Neptune taken at six wavelengths with the Hubble Space Teles cope in October and November 1994 revealed several atmospheric feature s not present at the time of the Voyager spacecraft encounter in 1989. Furthermore, the largest feature seen in 1989, the Great Dark Spot, w as gone. A dark spot of comparable size had appeared in the northern h emisphere, accompanied by discrete bright features at methane-band wav elengths. At visible wavelengths, Neptune's banded structure appeared similar to that seen in 1989.