As always, Bobby has so many incisive and to-the-point questions. Today's questions were about asteroids – Bobby knew about the asteroid that is due to swing past Earth on Halloween (beyond the orbit of the Moon, though... we'll be OK!) so we looked a bit at what asteroids are. At the same time we talked about the extinction of the dinosaurs due to an asteroid, and the difference between asteroids, meteors, meteorites, and meteoroids. We concluded class by talking about Hubble's tuning fork classification of galaxies.