A large expanse of black rocky glass littering a Chilean desert remained a mystery for a decade, but Brown University experts already have proven that an exploding comet created it.
Scientists have found strange patches in the Atacama Desert in northern Chile, which is one of the driest places on Earth, with a high atmospheric temperature.
Heat from a comet exploding just above the ground in what is now the Atacama Desert in Chile fused sandy soil into patches of glass around 12,000 yeas ago.
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