Mnemonic Device:

• My Very Educated Mother Just Served Us Nine Pizzas

Alternative mnemonics:

• Make Venus Eat My Jello, Serena’s Up Next**
• Many Very Early Men Just Sat Under Native Palms
• Many Violent Evil Maniacs Join Swiftly Under Nationalism**
• Mary’s Violet Eyes Make Johnny Stand Up Now, Period
• Men Very Easily Make a Jug Serve Useful Needs**
• Mercury Viewed Earth’s Many Aspects Joyfully Sitting Under Neptune**
• Mom Visits Every Monday, Just Stays Until Noon, Period
• Most Volcanoes Erupt Mulberry Jam Sandwiches Under Normal Pressures
• Most Volcanoes Erupt Mulberry Jam Sandwiches Under Neptune**
• Mother Very Eventfully Made a Jelly Sandwich Under No Protest
• Mums Very Easy Map Just Shows You North**
• My Very Eager Mother Just Served Us Nachos**
• My Very Easy Method Join Stampy Until Nighttime
• My Very Easy Method Just Set Up Nothing**
• My Very Easy Method Just Simplifies Us Naming Planets
• My Very Easy Method Just Speeds Up Naming Planets
• My Very Easy Method, Just Say You kNow Planets
• My Very Easy Method: Just Sleep Until Noon**
• My Very Easy Method Just Speeds Up Naming Planets
• My Very Easy Method: Just SUN**
• My Very Easy Mother Just Sat on Uncle Ned!**
• My Very Educated Mother Just Served Us Nachos**
• My Very Educated Mother Just Served Us Nectarines**
• My Very Educated Mother Just Served Us Noodles**
• My Very Educated Mother Just Served Us Nine Pizzas
• My Very Educated Mother Just Showed Us Nine Planets
• My Very Elderly Mother Just Sat on Uncle Ned’s Parrot
• My Very Empty Mouth Just Swallowed Up Nice Pineapples
• My Very Energetic Mouse Jumped Straight Up Nelly’s Pants
• My Very Energetic Mother Jumps Seven Umbrellas Nearly Perfectly
• My Very Energetic Mother Just Served Us Nine Pickles
• My Very Energetic Mother Just Served Us Nine Pizzas
• My Very Enthusiastic Mockingbird Just Sat Under Nancy
• My Very Evil Mother Just Smacked Unicorn’s Nose**
• My Very Excited Mother Just Sat Upon Needles (and Pins)
• My Very Eyes May Just See Under Nine Planets
• My Vicious Eagle, Margo, Just Survived Ukraine’s Nuclear Poisoning
• Muggles’ Vuggles Enable Muggle Jugglers So Uggles Nuggle Ptuggle
• some Mothers Vanish Through Making a believable Jester, So Uniforms’ Names Pride
• Start My Vehicle. Experience Marathon Journeys. See Undiscovered New Places.

Explanation:
What is the order of the planets in our solar system? Use one of these tools to easily learn this and you’ll never forget it again!

The first letter of each word gives you the first letter of the planets, in order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.

*In 2006, a committee of astronomers elected that Pluto should not be classified as a planet. They considered how there are dwarf planets such as planet UB313 also known as Eris; and Pluto has certain similarities with that ‘dwarf planet’ classification rather than ‘planet’ classification.

Variation:

• Murky conVention’s Efforts Mar *Series; Jury Set yoUr Next *Planet *Chart *Abridged.

Taking the first prominent letter of each word of that sentence:
M=Mercury [Murky], V=Venus [conVention], E=Earth [Efforts], M=Mars, ‘Series’ sounds like Ceres; J=Jupiter, S=Saturn, U=Uranus, N=Neptune, P=Pluto, Ch=Charon, Ab sounds like UB [an astronomical prefix for the next big body in space]

*The asterisk in this mnemonic is used in places to emphasize the dwarf planets’ words.

More about the Sun and its planetary system on Wikipedia

Learn more about our Solar system at the Big History Project

See the other mnemonics for astronomy…