Wednesday, 1 April 2009
Van de Graaf crater
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Van de Graaf crater, located on the far side of the Moon south of Aitken crater on the outer edge of the South-Pole Aitken basin. This area has several unique characteristics First, a relatively strong magnetic field was detected near this crater by the Apollo 15 subsatellite magnetometer. This discovery was unusual for the lunar surface because the Moon does not currently have a global magnetic field like the Earth does! Second, Van de Graff and the surrounding area also have slightly higher concentrations of thorium, which suggests the presence of a geochemically important thorium-rich lunar material called KREEP. Finally, if you look closely at the crater walls, you can see an unusual grooved texture.
Anaglyph image with exaggerated topography of Van de Graaf crater on the lunar far side created using Apollo Metric Images AS15-M-0075 and AS15-M-0076.
[NASA/JSC/Arizona State University]
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