Lol, I'm no expert! I actually erroneously read the sentence as, "Its day is longer than its year" the first time through. I looked it into it further (to prove it wrong) and discovered that depending on the definition of "day" one chooses it could actually be true! The hint at the bottom made it obvious the error was with classifying Pluto as a planet, but I was curious and figured I would bring it up anyways.