Pluto no longer qualifies.
でも、冥王星は無くなった訳じゃないし、これからも太陽の周りを回り続ける。重要なのはそれらのシステムを学ぶこと・・・だそうです。：-）
そそ、元々惑星ミネルヴァの残骸な訳だしねｗ（SF：星を継ぐもの J.P.ホーガン著）
以下引用：
The IAU has changed the definition of "planet" so that Pluto no longer qualifies. There are now officially only eight planets in our solar system. Of course this change in terminology does not affect what's actually out there. In the end, it's not very important how we classify the various objects in our solar system. What is important is to learn about their physical nature and their histories.
