An enormous impact crater, hiding deep beneath Greenland's Hiawatha glacier, is probably the result of a kilometer-wide asteroid that crashed into Earth 58 million years ago.
, researchers suspected it was made by a meteorite sometime between 12,000 years ago and three million years ago., and judging from the conditions of the crater, the asteroid that created it seemed to have crashed into an already formed ice sheet.
Using two different dating methods, researchers from Denmark and Sweden have now both landed on a similar date – one that experts weren't expecting.geologist Michael Storey from Denmark's Natural History Museum. The isotopes of this gas were then used to determine how much radioactive decay had occurred since the moment the minerals melted from the meteorite's impact.
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