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Greenland ice sheet hides huge impact crater

The 31km-wide depression came to light when scientists examined radar images of the island's bedrock.Investigations suggest the feature was probably dug out by a 1.5km-wide iron asteroid sometime between about 12,000 and three million years ago.But without drilling through nearly 1km of ice to sample the bed directly, scientists can't be more specific."We will endeavour to do this; it would certainly be the best way to get the 'dead fish on the table' (acknowledge the issue, rather than leaving it), so to speak," Prof Kurt Kjær, from the Danish Museum of Natural History, told BBC News.If confirmed, the crater would be the first of any size that has been observed under one of Earth's continental ice sheets.

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