It has never been fully understood how our atmosphere protects us from meteoroid impacts. It’s well recognized that meteoroids often explode. At 9:20 in the morning on February 15, 2013, the sky above Chelyabinsk, Russia, turned brighter than the Sun. Commuters shielded their eyes. Schoolchildren ran to the windows. About a minute later, those windows blew inward across six cities.

So why do meteors explode before they reach Earth? The answer begins in moments like that one. And the strange, reassuring truth buried inside it is this: the explosion was not the disaster. The explosion was the rescue. A rock weighing as much as a small ship arrived over Russia that morning and reached the ground as little more than a scattering of stones, because Earth’s atmosphere tore it apart first.

For years, scientists knew that meteors break up high overhead. What they could not agree on was the mechanism, the precise blow that kills the rock. In 2017, a team at Purdue University offered an elegant answer. In 2023, a team at Lawrence Livermore National Laboratory ran the numbers again and found something different. This is the story of a shield we cannot see, the fireball that tested it, and a scientific question that is still being settled. It is also the story of a civilization that has been keeping careful notes on falling stars for 3,000 years.

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