The eight planets in order in the solar system—Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune—can be remembered with a few different mnemonics: My Very Educated Mother Just Served Us Noodles My Very Excellent Mother Just Sent Us Nachos Prior to 2006, Pluto was the ninth planet in the solar system. (It has since been downgraded to a dwarf planet.) A common mnemonic used to remember the solar system was: My Very Eager Mother Just Served Us Nine Pizzas.