Dr. Tancredi - Diverting asteroids and redefining planets!

Dr. Tancredi is responsible for reclassifying Pluto as a "dwarf planet" and also used the Double Asteroid Redirection Test (DART) mission of NASA to study how impact ejecta evolve into a tail. He also shared how he missed discovering the "asteroid of the century" and that once he had a talk advertised using smoke signals. Check out this amazing episode!!