Earth’s oldest asteroid impact site discovered in Australia


  • The impact left behind a scar on the land that’s known as the Yarrabubba impact crater.
  • The impact could have released up to 11,000 trillion pounds of water vapor into the atmosphere.
  • It’s the world’s oldest known impact site, the study said, one that also may have changed Earth’s climate.

Some 2.2 billion years ago, an asteroid slammed into the Earth, leaving behind a massive, 43-mile-wide crater in what’s now Western Australia, scientists announced Tuesday.  

It’s the world’s oldest known impact site, the new study said, one that also may have changed Earth’s climate: It occurred at a time that coincided with Earth’s recovery from an ice age known as “Snowball Earth,” where most of Earth’s surface was covered with ice sheets up to 3 miles thick, according to a statement from Imperial College in London.

The impact left behind a scar on the land that’s known as the Yarrabubba impact crater. “The age we’ve got for the Yarrabubba impact structure makes it the oldest impact structure on the planet,” study co-author Chris Kirkland, a geologist at Australia’s Curtin University, told the Australian Broadcasting Corp.

That’s about half the age of Earth itself and 200 million years older than the previous record-holder, the 190-mile-wide Vredefort Dome in South Africa, according to Space.com

The Yarrabubba crater in Western Australia is now believed to be the world's oldest impact crater, at some 2.2 billion years old.

The Earth has a continually changing surface due to tectonics and erosion, which means that very old impact craters are difficult to identify, the study said. Scientists analyzed minerals within the crater that revealed the precise age for the impact event.  

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After blasting into the continental ice sheet, the impact could have released up to 11,000 trillion pounds of water vapor into the atmosphere, a potent greenhouse gas that may have played a role in modifying Earth’s climate.

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