What factor is now thought to have played a major role in such diverse events as the formation of the Moon, the tilting of Earth's spin axis, and even the extinction of the dinosaurs?

Question

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Collisions between asteroid-like bodies and Earth are now thought to have played a major role in events such as the formation of the Moon, the tilting of Earth's spin axis, and the extinction of the dinosaurs. These events were caused by large asteroids or comets colliding with Earth and causing significant impact damage.

What Factor Is Now Thought to Have Played a Major