My Very Educated Mother Just Sent Us Nine Pizzas.
Each word in the mnemonic corresponds to the first letter of each planet's name, starting from the sun:
• M - Mercury
• V - Venus
• E - Earth
• M - Mars
• J - Jupiter
• S - Saturn
• U - Uranus
• N - Neptune
• P - Pluto (though no longer considered a planet, it is still included in this mnemonic)