Scientists are constantly searching for asteroids that could crash into Earth. But if they find one, will they be able to do anything about it? NASA has launched a spaceship that will slam into an asteroid to find out. For more from Unexplainable, go to http://vox.com/unexplainable This episode of Unexplainable was reported by Brian Resnick and produced by Mandy Nguyen. Editing by Katherine Wells, Meradith Hoddinott, and Noam Hassenfeld, who also did the scoring for this episode. Richard Sima checked the facts and Cristian Ayala was on mixing and sound design. Mixing for Recode Daily was by Melissa Pons (Hemlock Creek Productions).  Support Unexplainable and Recode Daily by making a financial contribution to Vox! bit.ly/givepodcasts Learn more about your ad choices. Visit megaphone.fm/adchoices