Most astronomers now believe the demise of the dinosaurs 65 million years ago was caused by a large asteroid impacting the Yucatan peninsula area.

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The prevailing scientific consensus is that the mass extinction event that led to the demise of the dinosaurs about 65 million years ago was primarily caused by a large asteroid impact, known as the Chicxulub impactor, in the area of what is now the Yucatan Peninsula in Mexico. This event led to significant environmental changes that disrupted the dinosaurs' ecosystems.

Most Astronomers Now Believe the Demise of the Dinosaurs 65