伯尔尼大学领导的国际研究团队通过计算机模拟和欧空局Hera航天器的观测数据，提出了一个统一的解释框架来破解火星卫星Deimos的两个长期谜团。1该研究发现，一次单一的小行星撞击事件可能同时导致了Deimos南极附近的巨大凹陷和其表面异常光滑的尘埃覆盖。1相关成果已发表在《自然天文学》杂志上。1
根据模拟结果，一颗宽约320米的小行星以45度角撞击Deimos，产生的碎屑物质覆盖了整个卫星表面，但撞击力度尚不足以将其摧毁。1这些碎屑在某些地区的沉积深度可能超过200米。1研究团队为了验证这一假说进行了约100次计算机模拟，每次模拟耗时约一周。1这也是首次使用Hera航天器的Deimos掠过观测数据进行科学发表。1Deimos的物理特性更接近"碎石堆小行星"而非传统意义上的行星卫星。1
An international research team led by the University of Bern has used computer simulations and observational data from the European Space Agency's Hera spacecraft to propose that a single asteroid impact could account for two puzzling features of Deimos, the smaller moon of Mars: a massive depression near its south pole and an unusually smooth, dust-covered surface.1 The simulations indicate that an asteroid approximately 320 meters wide struck Deimos at a 45-degree angle, ejecting debris that blanketed the entire moon without shattering it.1
The research, published in Nature Astronomy, represents the first scientific publication to utilize observational data collected during Hera's flyby of Deimos.1 The team conducted roughly 100 simulations, each requiring approximately one week of computational time, to test various impact scenarios.1 Their findings suggest that deposits from the impact may exceed 200 meters in depth in certain regions across Deimos.1 The analysis also reveals that Deimos' physical characteristics resemble those of a "rubble pile asteroid" more closely than Earth's moon.1
The European Space Agency's Hera spacecraft is scheduled to undergo a Mars gravity assist maneuver in March 2025 to alter its trajectory,1 while Japan's space agency JAXA is planning to launch its Martian Moons Exploration mission in 2026 to further investigate the Martian satellite system.1
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