Tim Spahr is the CEO of NEO Sciences LLP and former director of the Minor Planet Center in the Harvard-Smithsonian Center for Astrophysics. He is also the coordinator of the Planetary Society's Shoemaker NEO Grant program.
Asteroid Day, June 30th, marks the anniversary of the great Tunguska impact that leveled a Siberian forest. It reminds us that a Near Earth Object can destroy a city or even a civilization. Former Minor Planet Center Director Tim Spahr reviews our efforts to find and understand these bodies.