Tiny spherules embedded in layers of rock are giving researchers precise information about asteroid impacts going back to Earth’s early history from 3.5 billion to 35 million years ago.
“Some of these impacts were several times larger than the Chicxulub impact that killed off the dinosaurs 65 million years ago,” says Purdue University physics graduate student Brandon Johnson.
Full story at Futurity.
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Photo credit: Bruce Simonson