In movies and TV shows, asteroids the size of cities are often referred to as `planet killers'. Scientists have developed cutting-edge technology that can prevent such asteroids from destroying Earth. <br /><br />Thanks for watching. Follow for more videos. <br />#cosmosspacescience <br />#howtheuniverseworksseries <br />#season6 <br />#episode9 <br />#asteroids <br />#killerasteroids <br />#comets <br />#rocksinspace <br />#cosmology <br />#astronomy <br />#spacetime <br />#space <br />#nasa <br />
