The Conversation

How can dark matter cause chaos on Earth every 30 million years?

Author: The Conversation USA

Are you afraid of the dark matter?European Southern Observatory, CC BY

In 1980, Walter Alvarez and his group at the University of California, Berkeley, discovered a thin layer of clay in the geologic record, which contained an unexpected amount of the rare element iridium.

They proposed that the iridium-rich layer was evidence of a massive comet...

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The Conversation

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