Why all planets, dwarf planets, natural satellites and so on are so different from each other if they come from the same protoplanetary disk? Why do planets revolve around the Sun? Is there any reason why the planets make that movement? Why Pluto ceased to be a planet and why asteroids such as Ceres or Vesta, which are in the asteroid zone, are called —like Pluto— dwarf planets? Find the answers to all those questions in this "Cielos despejados" video.