Earth's perilous journey through the Milky Way's spiral may shape the planet's geology

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This illustration of the Milky Way shows the spiral arms that Earth passes through roughly every 200 million years. Earth's journey through the Milky Way may have had a profound impact on our planet's geology. New research indicates that every 200 million years, when Earth passes through its galaxy's spiral arms, the planet is pummeled with high-energy comets, and this bombardment may thicken Ear...

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