From the initial letters of the names of the eight planets, plusPluto, formerly considered a planet.

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1. (astronomy, slightly dated, mnemonic)Used to remember the order and names of the (then) nine planets of thesolar system:Mercury,Venus,Earth,Mars,Jupiter,Saturn,Uranus,Neptune,Pluto.

• Pluto was relegated to status ofdwarf planet by theIAU in 2006.

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