One popular acronym for remembering the planets is "My very eager mother just served us nine pickles." Another popular acronym is "My very easy method just speeds up naming planets." These acronyms were created before Pluto was reclassified by the International Astronomical Union as a dwarf planet.
The first letter of each word represents a planet in order, moving away from the sun. Mercury is closest to the sun, then come Venus, Earth, Mars, Jupiter, Uranus, Saturn, Neptune and finally the dwarf-planet Pluto. There are many variations of acronyms used to remember the planets, and children and teachers often make up their own.