Massive 19-mile-wide crater in Greenland actually much older than we thought, study says - USA TODAY

The crater, big enough to swallow Washington, D.C., was discovered in 2015 and thought to have formed 13,000 years ago. But it's actually much older.

The massive 19-mile-wide Hiawatha crater underneath the northwestern ice sheet in Greenland is millions of years older than previously thought, according to new research published Wednesday in the pe… [+2123 chars]

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