Many of Earth's mass extinctions await clear explanations. We know an impact wiped out the dinosaurs, but what about the planet's other extinction events? New research says flybys of planetary mass objects could've been responsible.
Many of Earth's mass extinctions await clear explanations. We know an impact wiped out the dinosaurs, but what about the planet's other extinction events? New research says flybys of planetary mass objects could've been responsible.
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