Killer asteroids abound. NASA is ready to do something about it Phys.OrgNASA DART Launch: Key Step Forward in Planetary Defense SciTechDailyMax Q: Get in loser, we’re smashing a spacecraft into an asteroid TechCrunchHow NASA will practice saving the world from an asteroid apocalypse | TheHill The HillNASA and SpaceX Launched First Rocket to Test a Defense System Against Giant Asteroids in the Future Good News Network