We could do this in theory by studying an enormous impact crater, known as the South Pole-Aitken Basin.
理论上，我们可以通过研究一个名为南极-艾特肯盆地的巨大陨石坑来做到这一点。
An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.
尤卡坦半岛上富含铱的沉积层和一个巨大的陨石坑提供了证据，证明了约6500万年前，一颗大型陨石撞击了地球。
In other deposits, they're either sedimentary, or in the center of an impact crater.
其它矿藏要么是由沉淀物生成的，要么处于撞击火山的中心。
This image shows part of a 7.4-mile-diameter impact crater on Mars' southern hemisphere.
这张照片展示了位于火星南半球一个直径11公里冲击陨坑的一部分。
For scale, the large impact crater in lower right corner is about 18.5 miles, or 30 km, wide.
右下角的巨大陨石坑按比例宽约18.5英里，或30公里。
This image shows the west-facing side of an impact crater in the mid-latitudes of Mars' northern hemisphere.
这幅图片显示了火星北半球中纬度地区的一个面向西侧的陨石坑。
They conducted surveys at numerous sites in Mexico, including a spot called El Peñón, near the impact crater.
他们在墨西哥的很多地区，包括一个在陨石坑附近的叫做El Peñón的地区进行了调查。
In the centre of the image, the floor of an impact crater almost 50 km wide is covered in dark material.
在图像的中心，一个陨石坑地面将近50公里宽覆盖着黑色的物质。
In contrast, the 34-km-wide impact crater to the lower right of the image is largely filled with light material.
相比之下，34公里宽的陨石坑，以图像的右下角，主要是充满了轻型材料。
Named after the famous Portuguese navigator and explorer Ferdinand Magellan, the impact crater is about 100 km across.
麦哲伦陨石坑以葡萄牙著名航海家麦哲伦的名字命名，直径约100公里。
However, Italian scientists from the University of Padova believe that the Wembo-Nyama feature is an impact crater.
但来自意大利帕多瓦大学的科学家认为，文博尼亚马之地是陨石撞击形成的。
Mimas, one of the smaller round moons of Saturn, sports Herschel crater, one of the larger impact craters in the entire Solar System.
土卫一，土星的一颗较小的卫星，却炫耀着全太阳系最大的撞击坑之一的赫歇尔环形山。
Scientists have to sample the rock in the Wembo-Nyama feature to confirm whether or not it is an impact crater and when it formed.
科学家要从文博尼亚马之地提取岩石样本，以便确认这是不是一个陨石，以及它是什么时候形成的。
What appeared on his screen was something typically seen only on our own moon and other planets — a meteorite impact crater 148 feet across.
他的屏幕上出现的是一些我们通常在月球和其它行星上看见的东西- - -一个148英尺宽的陨石坑。
Although it resembles an impact crater, it formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock.
尽管它看起来像是一个陨石撞击坑，它是在一个火山穹丘硬化和逐步侵蚀中，剥离出洋葱状岩石层的结果。
We could do this in theory by studying an enormous impact crater, known as the south Pole AK basin. It's located in the moon's south polar region.
做到这点，理论上我们可以通过研究一个巨大的撞击坑，比如南极ak盆底，它位于月球南极地区。
Types of lakes: tectonic lake, crater lake, fluvial lake, dammed lake, glacier lake, karst lake, Aeolian lake, impact crater lake and artificial lake.
湖泊分类：构造湖、火山口湖、冲积残留湖、堰塞湖、冰川湖、喀斯特湖、风成湖、陨石撞击湖和人工湖。
This observation from NASA's Mars Reconnaissance Orbiter shows the floor of a large impact crater in the southern highlands, north of the giant Hellas impact basin.
这幅来自NASA火星轨道观察器的图像显示了位于火星南方高地巨大的Hellas撞击盆地北侧地表上的一个大撞击坑。
The South Pole's Aitken Basin, an eight-mile deep gouge in the lunar crust, ranks as the largest impact crater in the solar system, and could hold water in the form of ice.
南极的艾肯特盆地陷入月球表面8英里，称得上是太阳系内最大的撞击形成环形山，那里可能存在着冰块形式的水。
Toward the top (northern) end of the image, the ice becomes sparser, but the walls of a large impact crater in the upper-left corner provide a refuge for an oblong ice deposit on the crater floor.
接近照片顶部尽头(即北部)，冰雪变得较稀少，但是左上角一个巨大的撞击陨石坑壁却为环形山底的一块椭圆形积冰提供了庇护所。
Mimas, at the upper right, has an enormous impact crater on one side, and Tethys, at the bottom, has a huge rift zone called Ithaca Chasma that runs nearly three-quarters of the way around the moon.
右上角的是土卫一，在它上面的一边上，有着一个巨大陨石坑；底部的是土卫三，上面有一个巨大的、称为伊萨卡峡谷的裂谷带，它几乎占了该卫星绕行路线的四分之三。
This impact released an enormous amount of energy, excavating a crater about twice as large as the lunar crater Tycho.
这次撞击释放了大量的能量，挖出了一个大约有月球上的第谷陨石坑两倍大的陨石坑。
An asteroid of this size would be expected to leave an immense crater, even if the asteroid itself was disintegrated by the impact.
这样大小的小行星即使受到冲击碎裂之后也会留下一个巨大的陨石坑。
Also, large blocks thrown aside by the impact would form secondary craters surrounding the main crater.
此外，撞击留下的大块物质会在主火山口周围形成二级火山口。
The crater was formed by a meteorite impact billions of years ago, and if there were water on the planet back then, it would have accumulated in the crater, turning it into an evaporative lake.
这一撞击坑是由几百万年之前一颗陨石的撞击形成的，如果当时这颗星球上有水，这些水可能已经聚集到了撞击坑里，使其变成一个蒸发湖。
But the team concluded that those anomalies were created by jumbling of strata when debris flowed back into the crater after the impact.
但是小组总结认为这些异常是当碎片在撞击后回流到陨石坑时的地层混杂造成的。
But if the dinosaurs were killed by a massive meteor impact, where was the crater?
如果真是大规模运行冲击造成了恐龙灭菌，那些陨石坑在哪？
But if the dinosaurs were killed by a massive meteor impact, where was the crater?
如果真是大规模运行冲击造成了恐龙灭菌，那些陨石坑在哪？
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