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The uncertainty of science: By creating what they call “Europa in a can” here on Earth, scientists have determined that the dark material that appears to have seeped out of Europa’s long linear fractures might be sea salt from the underground ocean, turned brown by the harsh radiation hitting the moon’s surface.
This result is quite intriguing, but the only thing certain about it is its uncertainty. The only way we will know what this brown material really is will be to go there again with much better equipment and study the material itself