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about 66 million years ago a 10 kilometer wide object from space hit the earth and initiated the fifth mass extinction event from causing wildfires that raged across the continents to triggering tsunamis the impact wiped out nearly 75 of life on the planet and specifically led to the extinction of non-avian dinosaurs in addition the impactor left behind a vast 180 kilometer wide crater known as the chickaloo crater underneath the yucatan peninsula in todayamp;#39;s mexico so far scientists have believed that there was a single massive chunk of rock that triggered the extinction event but now in a groundbreaking discovery theyamp;#39;ve found evidence that the chiksalub impactor didnamp;#39;t come alone instead it had a companion whose impact created the newly discovered nadir crater so how did scientists discover this crater how do they know its impactor contributed to the extinction of the dinosaurs finally and most importantly how many more such craters from that period lay undisc
