The dinosaur asteroid extinction hypothesis was only proposed in 1980 and is still only a weak theory Most scientists today believe this explains only a few of our past extinctions, realizing now there were many extinction level events throughout history which had nothing to do with comets or asteroids. https://en.m.wikipedia.org/wiki/Alvarez_hypothesis
The dinosaur asteroid extinction hypothesis was only proposed in 1980 and is still only a weak theory Most scientists today believe this explains only a few of our past extinctions, realizing now there were many extinction level events throughout history which had nothing to do with comets or asteroids. https://en.m.wikipedia.org/wiki/Alvarez_hypothesis
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