The dinosaurs are believed to have gone extinct around 66 million years ago, as part of a mass extinction sometimes known as Cretaceous-Tertiary (or "K-T") extinction that wiped out as many as three quarters of plant and animal species on earth. Evidence for this extinction lies in iridium rich layer of sediment found in rocks believed to have come from an asteroid.
The asteroid theory has been dubbed the Alvarez hypothesis after the Nobel prize winner and San Francisco-born Luis Alvarez who proposed it. Luis Alvarez gained his PhD from the University of Chicago and was a member of California's Bohemian Club (founded 1872). Observing particle interactions through a bubble chamber he designed was key to him winning the Nobel Prize.
The asteroid theory has been dubbed the Alvarez hypothesis after the Nobel prize winner and San Francisco-born Luis Alvarez who proposed it. Luis Alvarez gained his PhD from the University of Chicago and was a member of California's Bohemian Club (founded 1872). Observing particle interactions through a bubble chamber he designed was key to him winning the Nobel Prize.
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