More than 1500 years ago, a vast culture known as the Hopewell tradition (or Hopewell culture) stretched across what is today the eastern United States.
The cause of the culture's decline has long been debated, with war and
The hypothesis is that debris from a passing comet may have struck close to the Ohio Hopewell communities, causing an airburst that would have profound and potentially devastating effects on the local environment. "The Miami tell of a horned serpent that flew across the sky and dropped rocks onto the land before plummeting into the river,"
The micrometeorites left behind in such events can reveal a chemical fingerprint, the researchers say.
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