Asteroid impacts on the Earth and moon have increased since the dinosaurs lived.

Some 290 million years ago, as the last trilobites scuttled across the seafloor, the skies above grew just a little more ominous. At that point, large asteroids including the impactor that would later kill off the dinosaurs began to rain down on our planet between two and three times more frequently than they did before.That impact was singularly catastrophic. But, according to a new study published today in the journal Science, that smashup was also just one episode in an ongoing spike of gargantuan asteroid impacts bombarding our neck of the solar system.

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