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Ancient Earth was bombarded with 10 times the number of asteroids and comets than previously thought | Daily Mail Online
Billions of years ago, the Earth was hit by more asteroids and comets than previously thought, which caused a disruption in the formation of its atmosphere and lower oxygen levels.
↗ https://www.dailymail.com/sciencetech/article-10128559/Ancient-Earth-bombarded-10-times-number-asteroids-comets-previously-thought.html