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.

Scientists have discovered that the massive Hiawatha crater in Greenland is much older than previously thought. Video Elephant The massive 19-mile-wide Hiawatha crater underneath the northwestern i… [+2770 chars]

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