Tiny Meteors Leave Smoke in the Atmosphere. NASA’s Studying It.

It’s time for the Geminids, the annual December meteor shower! Every year, Earth passes through the debris trail from the asteroid 3200 Phaethon. The pea-sized rocks it leaves behind burn up in our atmosphere, producing glowing trails in the night sky. People around the world will stare skyward and marvel at these meteors, also known as shooting stars.

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