Dice Carl Sagan en Cosmos capítulo 4 (Heaven and Hell):

If we move out past the terrestrial planets, beyond Mars, we find ourselves in a different regime of the solar system, in the realm of Jupiter and the other giant, or jovian, planets.

These are great worlds, composed largely of the gases hidrogen and helium and some other stuff too. When we look at the surface we do not see a solid surface, but only an ocassional patch of athmosphere and a complex of multicolor clouds.

These are serious planets, not fragmentary little wordlets like the Earth. In fact, a thousand earths will fit in the volume of Jupiter.

If a comet or asteroid were to accidentaly impact jupiter, it would be very unlikely to leave a crater, it might make a momentary hole in the clouds but that’s it.

I todavía la IAU (Irrelevant Astronomical Union jaja) tiene la desfachatez de decir que Plutón no es un mundo…. de hecho según su propia definición, Neptuno tampoco, ya que si hubiera limpiado todo alrededor de su óbrita órbita, Plutón no estaría ahí.