The Wesenheit was introduced as an alternative to this quantity by van den Bergh. A double power law may provide a better fit to the distribution of this quantity for objects at high redshift than an exponential decay with a power-law prefactor. Modified Newtonian dynamics that introduce a length scale cannot reproduce this quantity’s scaling with the fourth (-5[1])power of spiral velocity. Like that (15[1])(*) Tully-Fisher relation, the Faber-Jackson (10[1])relation links this quantity for elliptical galaxies to the stellar velocity dispersion. Stars with known values of this quantity can be used to measure distances. Henrietta Leavitt found this quantity’s relation to the period of Cepheid variables. This quantity equals brightness multiplied by surface area. For 10 points, name this quantity defined as the total power radiated by an object emitting electromagnetic radiation. ■END■ (10[1])