The Signs of the Times
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The Signs of the Times

October 23, 2009
NEAR Shoemaker's investigation of Eros from low altitude orbit continues to bring the asteroid's history into sharper focus. This pair of images, taken April 18, 2000, from an orbital height of 99 kilometers (61 miles), shows the dissimilarity of two different regions of the asteroid. The left panel shows a region typical of Eros, whereas the right panel shows the inside of the saddle. As the images show, the saddle region has far fewer craters.

Craters are formed by the explosive impacts of asteroid fragments that have rained onto the surface over the eons. A freshly exposed surface will have fewer craters than a surface exposed to space for a longer time. The lesser number of craters in the saddle shows that it has been wiped clean, or "resurfaced," by geologic processes relatively late in Eros' history.

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