Cocktail Party Fact

Just discovered: Sedna, the largest object found in solar orbit since Pluto in 1930. There have been a few similar-sized objects found over the last couple of years in the Kuiper Belt, always igniting tedious debate over whether it really is a planet. I wonder, though, how long it will be until children learning elementary astronomy are told that the solar system contains many things, of various sizes, and given some sort of breakdown of the makeup—rather than being required to simply list the planets, mnemonic-memory-aided, by rote.