一次撞击可能塑造了火卫二的形状与平滑表面

模拟研究表明，一次斜碰（oblique impact）足以解释火卫二（Deimos）最显著的两个特征。这一发现暗示该天体曾经历过一次撞击，从而形成了其南极的凹陷并覆盖了表面的风化层，其内部结构与近期探测过的小行星（asteroid）十分相似。

Nature Astronomy, Published online: 28 August 2026; doi:10.1038/s41550-026-02968-6 Simulations show that a single oblique impact can explain two of the most defining features of the smallest Martian moon — Deimos. The results suggest that one collision carved the moon’s south-polar depression and blanketed its surface in regolith, while revealing an interior structure much like that of recently visited asteroids.