picture of Europa
[IMG]C:/personal/Europa.jpg[/IMG]
The straight lines going every direction are cracks in the ice covering Europa that refrozen. These scars are probably a result of the same tidal forces that cause Io's vulcanism.
I think the theories of what's actually under the icy surface of Europa vary. Because it's so cold, liquid H20 seemed unlikely, but an ocean of hydrocarbons was a very plausible answer. I guess the current theory is water again. An entire OCEAN of hydrocarbons, exxon would pee their pants. I love this stuff.
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