Luis Alvarez and his team (including his son Walter Alvarez, Frank Asaro, and Helen Michel) published a landmark paper proposing that a giant asteroid or comet impact was the primary cause of the dinosaur extinction at the end of the Cretaceous period. Their evidence was based on a global layer of the element iridium, rare on Earth but abundant in asteroids. This impact theory, which revolutionized the understanding of mass extinctions, has since become the leading explanation for the demise of the non-avian dinosaurs.

The Alvarez impact hypothesis transformed the narrative of the dinosaurs' demise from a slow, mysterious decline to a sudden, catastrophic event. This dramatic story of a world-ending asteroid impact has captured the public imagination and inspired countless works of poetry and literature exploring themes of cosmic disaster, fragility, and the contingency of life. It has added a new layer of drama and tragedy to the story of the dinosaurs, making their extinction a powerful metaphor for the vulnerability of all species.