Dipak Srinivasan (@dipaksrinivasan), the External Engagements Lead with Johns Hopkins Applied Physics Laboratory (and Andy's former college classmate and roommate) returns to talk with Andy, Jesse and Matt about tomorrow's launch of NASA's first planetary defense mission, the Double Asteroid Redirection Test (DART), which will travel to the binary asteroid system Didymos over the course of next year to crash into the moonlet asteroid Dimorphos in an attempt to change its path and learn about how to prevent a real-life reboot of Armageddon and/or Deep Impact.