A Dog-Killing Meteorite Just Rewrote Mars’ Volcanic History

For millions of years, a group of tiny asteroids circled our solar system. Then, around 9 a.m. on June 28, 1911, one blazed into earthly skies near a village outside Cairo, Egypt. Locals watched the fireball, and they heard its explosion. A farmer even claimed a dog was killed by one meteorite fragment, making it—if true—the only known modern space rock casualty. Let’s hope it was just a rumor, but NASA says there’s no reason to doubt it.

In the years since, about a dozen siblings from th

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