Order of planets from the Sun
Astronomy   Wikipedia  
(Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune)

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Mean Very Evil Men Just Shortened Up Nature

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Mary's "Virgin" Explanation Made Joseph Suspect Upstairs Neighbour

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Many Very Educated Men Justify Stealing Unique Ninth

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My Very Educated Mother Just Served Us Nachos

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obsolete:

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My Very Educated Mother Just Said Uh-oh! No Pluto (Stephen Colbert's tongue-in-cheek mnemonic)

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My Very Easy Method Just Speeds Up Naming Planets

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My Very Easy Memory Jingle Seems Useful Naming Planets

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My Very Earnest Mother Just Showed Us Nine Planets

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My Very Educated Mother Just Served Us Nine Pies

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My Very Eager Mother Just Served Us Nine Pizzas

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Mary Visits Every Monday Just Stays Until Noon Period