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Europa - Another Ocean? The cracked, icy face of the Jovian moon Europa intrigues scientists, who have speculated that liquid water from a subsurface ocean may seep through the cracks. The reddish cast in this false-color, high contrast image may be due to ion bombardment and sulfur deposition from volcanic Io and/or micrometeorite bombardment of Europa's leading hemisphere (right). Alfred McEwen, U.S. Geological Survey