在地球45亿年的历史中，巨大的「行星杀手」小行星撞击深刻重塑了地质与生态进程。例如约2.14亿年前在加拿大形成的曼尼古根陨石坑（魁北克之眼），直径约5公里的小行星造成区域性生物灭绝，如今留下了巨大的环形构造；而3500万年前撞击俄罗斯西伯利亚的波皮盖小行星直径约7公里，其极端高压将地下石墨转变为大量冲击钻石，并可能引发了始新世至渐新世期间的全球冷却与物种更替。

在更为深远的地质年代与生物演化转折点上，小行星撞击带来了剧烈动荡与重组。加拿大约18亿年前形成的萨德伯里结构由约15公里宽的撞击体所致，穿透地壳激发深层岩浆并留下了丰富的镍、铜等金属矿藏；而6600万年前直径约15公里的希克苏鲁伯撞击则是史上最著名的大浩劫，引发了全球大火、巨型海啸以及长达数十年的核冬天，导致包括非鸟类恐龙在内约75%的物种走向灭绝。

除了毁灭性冲击外，极早期小行星事件亦塑造了生命萌发的地质环境。约40亿年前的后期重轰炸期（LHB）促使地球地壳碎裂并启动板块构造运动，同时水质小行星也带来了早期海洋所需的水分；而20.23亿年前在南非形成的弗里德堡撞击则是由已知撞击地球最大的25公里小行星所造成，直径达300公里的多环构造彻底消灭了大量单细胞生物，其罕见地貌堪比木星卫星上的巨型环状盆地。

Throughout Earth's 4.5-billion-year history, massive "planet killer" asteroid impacts have profoundly reshaped the planet's geological and ecological evolution. For instance, the Manicouagan impact in Canada roughly 214 million years ago was caused by an asteroid about 5km wide, triggering a localized extinction and leaving behind the vast ring-shaped "Eye of Quebec," while the 7km-wide Popigai impact in Siberia 35 million years ago instantaneously transformed underground graphite into industrial impact diamonds and was closely tied to late Eocene cooling and faunal turnover.

At critical junctures of planetary and biological history, catastrophic asteroid collisions triggered both mass destruction and vital mineral deposition. The Sudbury impact in Ontario approximately 1.8 billion years ago involved an asteroid roughly 15km wide that punctured Earth's crust and concentrated massive deposits of nickel, copper, and platinum, whereas the 66-million-year-old Chicxulub impact in Mexico unleashed global firestorms, mega-tsunamis, and a decades-long nuclear winter that wiped out non-avian dinosaurs and 75% of all living species.

Beyond pure devastation, early bombardment periods established the essential geodynamic and volatile foundation for life itself. The Late Heavy Bombardment roughly 4 billion years ago fractured the rigid primordial crust to initiate modern plate tectonics and likely delivered vital water to early oceans, while South Africa's 2.023-billion-year-old Vredefort impact—the largest confirmed collision in Earth's history, caused by a 25km asteroid—formed a colossal 300km multi-ring basin comparable to the giant impact structures seen on Jupiter's moons.