Luis Alvarez, Walter Alvarez, Frank Asaro, and Helen Michel propose that a giant comet or asteroid may have struck the Earth approximately 65 million years ago thereby causing massive extinctions and enriching the iridium in the K-T layer
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Citation: Editors, Litencyc. "Giant comet or asteroid Earth impact theory elaborated". The Literary Encyclopedia. First published 01 May 2009 [https://staging.litencyc.com/php/stopics.php?rec=true&UID=6750, accessed 23 November 2024.]
