a battered crater on Runit. Over the radioactive dump, the U.S. built an 18-inch thick concrete dome that stretched 377 feet ...

The discovery bolsters the theory that meteorite impacts played an important role in Earth's early geological history ...

"Given how rare such evidence is due to [Earth's] geological recycling processes, this is a major breakthrough in understanding early Earth." Geologists have discovered the world's oldest known ...

It all went into the Runit Dome, which the servicemen then covered with concrete. In total, the crater holds enough radioactive waste to fill 35 Olympic-sized swimming pools. Most of that is ...

Geologist and study co-author Tim Johnson said the dome was likely to be uplifted by the impact of the meteorite smashing into Earth. "So, when you form a really big crater, the middle bit forces ...

The resulting radioactive waste is still stored under the concrete “Runit Dome”. Now that’s at risk from heat and rising sea levels. Skip next section More on Nature and Environment from ...