Ask Ethan: Could we spot an extinction-level asteroid?
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65 million years ago, the trajectory of life on Earth was changed in an instant: when a massive asteroid, speeding through the inner Solar System, crashed into our planet. In the blink of a cosmic eye, thousands upon thousands of species that had previously dominated the world for millions of years went extinct, including 100% of the flying reptiles, non-avian dinosaurs, ammonites, and the giant marine reptiles, as well as massive populations of mammals, insects, clams, and land-based plants. Du
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