Description acceptable. Fourier (“foo-ree-AY”) analysis of an empirical correction function for this quantity reduces a constant from 2 to 1.7275 in a formulation by Mary Adela Blagg. The viscosity-driven “Type II” mechanism for lowering this quantity creates pressure “bumps” that slow its change. This quantity is multiplied by the cubed root of mass in the larger of the two most commonly used Hill spheres. The Late Heavy bombardment may be explained by a period of decrease in several bodies’ values for this quantity described by the (*) Nice (“neess”) model. This quantity is predicted to grow in powers of two by the Titius–Bode law. Due to a relationship with temperature, volatile compounds (-5[1])condense beyond a value for this quantity known as the frost line, which divides gas giants from rocky planets. For 10 points, what quantity for Earth defines an astronomical unit? ■END■ (10[3])