The Younger Driest Period

There's tremendous evidence at this point that it was a cosmic impact there's more than 50 or 60 sites across North America Europe South America South Africa that show the same consistent impact proxies. Other people have suggested volcanism other people suggest the sun on a randal talks about the sun being involved I think there's absolutely room for that as well we're learning far more learning far more about the sun and sun-grazing comets, he says.