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Evidence of Europan Ocean

Features in this false color image are the best geologic evidence to date that Europa may have had a subsurface ocean at some time in its past. The reddish-brown areas represent non-ice material resulting from geologic activity. White areas are rays of material ejected during the formation of the 25-km diameter impact crater Pwyll seen in the global view. Icy plains are shown in blue tones to distinguish possibly coarse-grained ice (dark blue) from fine-grained ice (light blue). Long, dark lines are ridges and fractures in the crust, some of which are more than 3,000 kilometers (1,850 miles) long.

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