According to the scientists, some of the dark and dusty material from the outer ring moves inward toward Iapetus, slamming the icy moonlike bugs on a windshield.

• 这提示科学家：就像虫子落在挡风玻璃上一样，外环中的黑暗尘埃微粒也会移向土卫八，并溅落在其冰冻表面上。