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


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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