A gigantic space rock that slammed into Earth more than three billion years ago grievously wounded the biosphere—and then ...
Cataclysmic cosmic collisions may have benefited the evolution of primitive organisms early in Earth's history, a study says.
Just a few smashups in the asteroid belt may account for 70 percent of Earth’s meteorites, limiting what’s known about our solar system’s history.
Some 3.26 billion years ago a giant rock between 50 and 200 times the size of the Chicxulub dino-killer smacked into our ...
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