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1. A planet must be round in shape. What this means is that is planet must be large enough to have had its mass pulled into a round shape as the result of its own gravitational forces. It was also suggested, but not made part of the definition, that a planet must be at least 1000 kilometers in diameter. 2. Planets must have a defined, regular orbit around the Sun, and not be either stars themselves or satellites of other planets. 3. To be a planet a space object must dominate its own orbit and clear its own area of other smaller space objects. A "dwarf planet" was defined as a celestial body that is in an orbit around the Sun, has sufficient mass for its own gravitational forces to assume a hydrostatic equilibrium or "nearly round" shape, has not cleared its orbital neighborhood of other space objects, and it is not a satellite. The IAU also resolved that all other space objects, except satellites orbiting the Sun, shall be referred to collectively as "Small Solar-System Bodies" The old mnemonic “My very energetic mother just served us nine pizzas� by which millions of people learned to recite the planets, no longer applies. However, We do have a new one to help you remember the planets in the new line up. “My very Energetic Mother Just Served Us Noodles.�/P> Here are some other, more original suggestions: “My very exhausted mother just sent us nachos�/P>
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