Myriad del Sol Poster

What is a planet, really? Is it any spherical world? Or just a solid one? Can't it be a moon to another planet, or must it be its own primary? I tend to think of a planet as any non-fusing mass that spherizes under its own gravity... which literally means that our solar system (Sol) has not 10, but dozens, and potentially hundreds. But we haven't had the opportunity yet to get close to and map every single one of them... Noteable exceptions include Triton and Enceladus (though that one may soon be coming), Xena or Gabrielle, Pluto, Charon, any many others (it gets hard to remember so many names!) But I rather like the idea of these to-scale family portraits, and hope to be able to do or see others of the same ilk for other stars within my lifetime. I did try to include the gas giants, but they were so much more enormous (at scale) than the rest that they distorted or drew too much focus away from the little but important guys. From Left to Right; Mars, Ice-Age Earth with Luna in foreground, Ganymede and Venus, Mercury, Europa, Callisto, Titan and Io.