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以下是你们的喷气推进实验室写的内容:
Here is what your Jet Propulsion Laboratory writes:

喷气推进实验室，2003年3月6日
Jet Propulsion Laboratory, 3/6/2003

美国宇航局，检索和编辑于2008年11月12日
NASA retrieved and edited 11 12 2008

"很难想象，地球上最大的撞击坑之一，180公里(112英里)宽，900米(3000英尺)深，会从人们的视线中消失了，但它确实消失了。
"It is hard to imagine that one of the largest impact craters on Earth, 180-kilometers (112-mile) wide and 900-meters (3,000-feet) deep, could all but disappear from sight, but it did.

"希克苏鲁伯陨石坑，位于墨西哥尤卡坦半岛，几十年来一直没有被发现，因为它隐藏(同时也保存)一公里深的年代较近的岩石和沉积物之下。现在，大多数科学家一致认为这是确凿的证据——有证据表明，6500万年前，一颗巨大的小行星或彗星确实撞击了地球表面，导致地球上70%以上的生物灭绝了，包括恐龙。这个想法最初是由路易斯和沃尔特·阿尔瓦雷斯这个父子团队在1980年提出的。
"Chicxulub, located on Mexico's Yucatan peninsula, eluded detection for decades because it was hidden (and at the same time preserved) beneath a kilometer of younger rocks and sediments. Most scientists now agree it's the ‘smoking gun’ -- evidence that a huge asteroid or comet indeed crashed into Earth's surface 65 million years ago causing the extinction of more than 70 percent of the living species on the planet, including the dinosaurs. This idea was first proposed by the father and son team of Luis and Walter Alvarez in 1980.

"从太空中，科学家们可以看到希克苏鲁伯陨石坑的一些表面特征，这些特征在地面看上并不那么明显。卫星图像显示，尤卡坦半岛北端有一串被称为天坑的陷坑，这是美国宇航局研究员们首先注意到的......当时是1990年。他们最早提出，希克苏鲁伯是与白垩纪末期和第三纪初期发生的大灭绝有关的撞击地点，它被称作为K/T边界。
"The view from space lets scientists see some of Chicxulub's surface features that are not nearly so obvious from the ground. Satellite images showing a necklace of sink holes, called cenotes, across the Yucatan's northern tip are what first caught the attention of NASA researchers … in 1990. They were among the first to propose Chicxulub as the impact site linked to the mass extinctions that occurred at the end of the Cretaceous and beginning of the Tertiary geological ages, called the K/T boundary.

‘我们对陨石坑的存在一无所知，’[美国国家航空航天局研究员凯文·]波普博士说，他现在是一名独立的地质学家，‘当时我们正在进行一个关于地表水和玛雅考古的项目，我们在[卫星]图像中看到这个完美的半圆形结构时，我们都被迷住了。我们得到了墨西哥石油公司在早些时候收集到的该地区的磁力和重力数据，这家公司一直在寻找石油。他们的数据显示，这是一个巨大的圆形结构，并确定这是一个撞击的陨石坑。波普和他的同事推断，这些坑是由埋在陨石坑边缘的裂缝造成的，坑的圆圈范围与陨石坑的底部是相对应的。
‘We were ignorant of the existence of a crater,’ says [NASA researcher Dr. Kevin] Pope, now an independent geologist, ‘We were working on a project on surface water and Mayan archaeology when we saw this perfect semi-circular structure in [satellite] images …. We were fascinated and got the magnetic and gravity data from the area collected earlier by the Mexican petroleum company, who had been looking for oil. Their data showed a large, remarkably circular structure that they had identified as an impact crater.’ Pope and his colleagues reasoned that the cenotes resulted from fractures in the buried crater's rim and that the area within the cenote ring corresponded with the crater's floor.

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