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You better keep your heads down. We're going to have some massive asteroids hitting Earth today. What sizes and shapes will they be? Which ones would do the most damage? And which one would have the best chance of hitting us? Uh oh, better pack up your shelter. What If in other places: What If in English: http://bit.ly/facebook-whatif What If in Spanish: http://bit.ly/YT-Spanish-what-if What If in Italian: http://bit.ly/Cosa-succederebbe-se What If in French: http://bit.ly/Et-si-youtube What If in Mandarin: http://bit.ly/YT-Chinese-what-if What If in Hindi: http://bit.ly/what-if-hindi-youtube Podcast: http://bit.ly/yt-what-if-show-podcast What If is a documentary miniseries that takes you on an epic journey of hypothetical worlds and possibilities. Come with us on an imaginary adventure through time, space and chance. We will do our best to explain complex topics in a fun way. Produced with love by Underknown in Toronto: https://underknown.com