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This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA)

NASA

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This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA) NASA

This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA) NASA

This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA) NASA

This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA)

NASA

This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA)

NASA

This is a close-up image of Europa taken by the Galileo spacecraft showing a giant fault. (Courtesy of NASA)

NASA