Sept. 2nd. This exhibit at Lowell Observatory wraps up September 2nd. Great Balls of Fire: Comets, Meteors, Asteroids is the topic; the threat of a catastrophic impact from an asteroid or comet is a staple of popular culture. If there was a dinosaur killer in Earth?s past, is there a human killer in our future? What are the chances? For that matter, what are asteroids, comets, and meteorites? This exhibit brings recent discoveries and cutting-edge planetary science to our visitors.More information at Lowell.edu