NASA’s Saturn-orbiting Cassini spacecraft this month made its closest pass yet of the odd, eyeball-shaped moon Mimas, which bears the scar of a massive, violent impact from its past.

Scientists aren’t sure why the giant impact that caused the crater didn’t cause the moon to break apart. Scientists may have more answers soon. On Saturday, Cassini passed within 5,900 miles of Mimas, taking pictures, temperature readings and measurements to learn more about what’s on its surface.

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