M.V.E.M.J.S.U.N.?

The useful mnemonic above will no longer need to be learned by rote as, after 76 years of faithful service, Pluto is no longer considered one of the planets of our solar system. On August 24th it was reclassified as a dwarf planet by the International Astronomical Union(IAU). Poor little Pluto was only able to meet 2 of the 3 required criteria to remain classified as a planet, but fortunately avoided the indignity of being relegated to "Small Solar-System Body"!


(Image from here.)

Nasa has all the info!

Oh, and the mnemonic..."My Very Elderly Mother Just Sat Up Near Pluto"!