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This April 30, 2012 satellite image provided by GeoEye shows the area around the Yongbyon nuclear facility in Yongbyon, North Korea. As North Korea warns that it plans its third nuclear test since 2006, outside governments and analysts are trying to determine a crucial question: Just what will Pyongyang's scientists explode? The last two tests are believed to have been of plutonium devices, but the next logical step for Pyongyang's ambitious nuclear program could be to conduct a highly enriched uranium explosion. That would be a major accomplishment for North Korea — and a worrying development that would raise already high stakes for the United States and its allies. This GeoEye imagery was provided when the U.S.-Korea Institute at Johns Hopkins School of Advanced International Studies said May 16, 2012 it shows that North Korea has resumed building work of the containment building for the light-water reactor after months of inactivity at the site in Yongbyon. (AP Photo/GeoEye)