Asteroids hitting Earth may result in mass extinctions.

Name: Asteroids hitting Earth may result in mass extinctions.
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Asteroids have collided with Earth in the past and caused mass extinctions, such as the one that occurred 65 million years ago and led to the extinction of the dinosaurs. It is also a potential threat in the future, hence NASA's efforts to track and study asteroids that come close to Earth.

Asteroids Hitting Earth May Result in Mass Extinctions