Earth's history is marked by one cosmic disaster after another, forging the path of human evolution; now, experts explore how the Earth has teetered on the verge of destruction. <br /><br />Thanks for watching. Follow for more videos. <br />#cosmosspacescience <br />#howtheuniverseworks <br />#season10 <br />#episode4 <br />#cosmology <br />#astronomy <br />#spacescience <br />#spacetime <br />#space <br />#nasa <br />#darkhistoryofearth <br />#earth <br />#historyofearth <br />#humanevolutiononearth <br />
