Scientists have identified Earth's oldest-known impact crater, and in doing...
WASHINGTON - Scientists have identified Earth’s oldest-known impact crater, and in doing so may have solved a mystery about how our planet emerged from one of its most dire periods.
“Looking at our planet from space, it would have looked very different,” said isotope geology professor Chris Kirkland of Curtin University in Australia, one of the researchers in the study published in the journal Nature Communications. “... You would see a white ball not our familiar blue marble.” The planet descended into one of its two primordial “snowball Earth” periods 2.4 billion years ago amid a rise in oxygen in an atmosphere formerly dominated by methane and carbon dioxide. The asteroid, estimated at 4-1/2 miles wide, landed at Yarrabubba in the state of Western Australia, coinciding with the end of the deep freeze.
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