An extraterrestrial impact is most closely linked to the Cretaceous extinction event.

天外来客对地球的撞击与白垩纪的物种灭绝事件有着最为密切的联系。

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After excluding various terrestrial factors, the possibility of the impact event of extraterrestrial body, similar to that at the end of the Cretaceous, becomes attractive.

在考虑了各种可能存在的地内因素后，类似于白垩纪末的地外物质撞击的可能性变得颇有吸引力。

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