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Three and a half billion years ago, a mega asteroid slammed into Earth, triggering massive tsunamis and leaving craters bigger than many U.S. states. It was the second oldest and one of the largest impacts known to have hit the planet.

Now, for the first time, remnants of that impact have been uncovered in ancient sediments in Australia, and they're revealing more intriguing details about the Earth at that time.

Image: Evidence of a monster asteroid impact were found in ancient sediments at Marble Bar in northwestern Australia. Credit: A. Glikson