When is a planet a planet and can Pluto now come back please.
http://www.blastr.com/2017-2-21/redefining-planets-answer-search-question But the Moon a planet? This definition is going to be just as confusing as the last one. In my mind, a planet is a round world, but not massive enough for nuclear fusion. A moon is something orbiting such a world. But now where do you draw the line where size is concerned, and like this article points out, should there be a line? Are all Saturn's ring particles (down to dust size) moons?