Pluto
Pluto fails to meet the third condition. Its mass is much less than the combined mass of the other objects in its orbit: 0.07 times. Earth, by contrast, is 1.7 million times the remaining mass in its orbit (excluding the moon). The IAU also decided that bodies which, like Pluto, meet criteria 1 and 2 but do not meet criterion 3, would be called dwarf planets.