Life on Earth Likely Arrived on a Comet

Comets and asteroids have been colliding with the Earth from the beginning of time, most recently about 100 years ago in Siberia. George Howard is an expert on cosmic impacts. He says they have occurred far more often, and are far more likely to strike again than most scientists think. He helped discover that the “Younger Dryas” period (about 11000 to 10,000 BC), which brought on an ice age that led to the extinction of animals such as the wooly mammoth and saber-toothed tiger, was caused by an asteroid colliding with the Earth. While mainstream scientists have yet to accept the theory, he reminds us that experts were also slow to accept that the same type of collision caused the extinction of the dinosaurs 230 million years ago. He also reports that life on earth likely arrived via a comet.
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