As elementary schoolers, we learned the order of the planets. Maybe your teacher even had a snappy mnemonic like “My Very Educated Mother Just Served Us Nine Pizzas” or “My Very Educated Mother Just Served Us Nachos” after Pluto was axed from the planetary lineup.
Click here for original story, What is the smallest planet? (It’s not Pluto.) Taking a closer look at planet sizes.
Source: Phys.org