My Very Earnest Mother Just Sent Us Nine Pickles,
To IAU, the presence of Pluto Tickles.
My Very Earnest Mother Just Said Us No,
Why does IAU do this, I dunno.
Take Pluto in - a request of mine,
Eight isn't better, make it nine.
Either change the definition,
Or give it an exception.
Sadly, we now have only 8 planets and Pluto along with Charon, Ceres and Xena is a dwarf planet
"My Very ..." are the mnemonics to remember the names of planets in sequence.