This week — asteroids. Could a space rock really slam into us and destroy the world? And if we did spot one heading straight for us, is there anything we could do to stop it? We speak with asteroid researcher Dr. Alan Harris, astrophysicist Dr. Sergey Zamozdra, computational physicist Dr. Cathy Plesko, and physicist Dr. Andy Cheng.  Check out the full transcript here: http://bit.ly/2MrW1vp  Selected references:  Overview of Chelyabinsk impact and risk from asteroids: http://bit.ly/2ECSRQQ  How many asteroids are out there? http://bit.ly/34EhyHl  DART mission overview: http://bit.ly/2SkBBZ1  Ways to stop asteroids: https://bit.ly/2sJqGgv  Credits: This episode was produced by Wendy Zukerman along with Lexi Krupp with help from Michelle Dang, Meryl Horn and Rose Rimler. We’re edited by Caitlin Kenney. Fact checking by Michelle Harris. Mix and sound design by Peter Leonard. Music written by Peter Leonard, Bobby Lord and Emma Munger. Recording assistance from Verónica Zaragovia, Sofi LaLonde, Lawrence Lanahan, and Kevin Caners. Translation help from Andrew Urodov and Dmitriy Tuchin. Thanks to all the scientists we spoke to: Dr. Carrie Nugent, Dr. Mark Boslough, Dr. David Kring, Dr. Daniel Durda, Dr. Kelly Fast and the other Dr. Alan Harris. A big thanks to Carl Smith at The Australian Broadcasting Corporation for suggesting this topic - Carl did a podcast series on a bunch of the Apocalypse scenarios! You can find it at the podcast Science Friction and search for the Apocalypse series. And thanks to the Zukerman Family and Joseph Lavelle Wilson.