One of the asteroids, asty, looks like an elongated potato. Surprisingly it has a tiny (compared to asty) spherical moon! This moon called Dactyl has a mass of 4.20x1016kg, and a radius of 1.57x104 meters, according to Wikipedia. Your friend just said that on a planet that size, that a sneeze would give you escape speed. We are curious now. Find the escape speed on Dactyl.