map of milky way

Earth’s perilous journey through the spiral Milky Way could shape the planet’s geology

Earth’s journey through the Milky Way may have had a profound impact on the geology of our planet. New research indicates that every 200 million years, as Earth passes through the spiral arms of its galaxy, the planet is struck by high-energy comets, and this bombardment can thicken Earth’s continental crust.

The team behind the new findings believe the dense gas clouds in the spiral arms interact with comets on the side of the solar systemsending them rushing to Earth.

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