About 66 million years ago, a 10-km-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-km-wide crater known as the Chicxulub crater underneath the Yucatán Peninsula in today'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 ground-breaking discovery, they have found evidence that the Chicxulub impactor didn'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 undiscovered? The 25th episode of the Sunday Discovery Series answers all these questions in detail. All Episodes Of The Series: https://bit.ly/369kG4p Basics of Astrophysics series: https://bit.ly/3xII54M REFERENCES: Research Paper: https://bit.ly/3SazYsu Chicxulub Crater: https://bit.ly/3QTxIEG The five extinction events: https://bit.ly/3BNSykB Boltysh Crater: https://bit.ly/3dnmvi8 Created By: Rishabh Nakra and Simran Buttar Narrated By: Jeffrey Smith The Secrets of the Universe on the internet: Website: https://bit.ly/sou_website Facebook: https://bit.ly/sou_fb Instagram: https://bit.ly/sou_ig Twitter: https://bit.ly/sou_twitter