Could an asteroid impact with Earth wipe out the human race? Known Universe explores what is being done to prevent such an Armageddon by heading to the first line of asteroid defense: the Lunar and Planetary Laboratory in Arizona. Here we see the technologies used to monitor the skies for near-Earth objects, including a football stadium-sized rock that will pass close to Earth on Friday the 13th, April 2029. Scientists predict it may be so close that gravity could cause a catastrophic collision.