These are the hypothetical planets that have fascinated the astronomers and the public alike, fueling both imagination and scientific inquiry. Tyche for example, is a planet that was once speculated to be lurking in the distant Oort Cloud, influencing the orbits of comets. The Counter-Earth, an ancient Greek concept, was thought to be a hidden twin of Earth on the opposite side of the Sun, always out of view. The planet Vulcan, proposed in the XIXth century, was believed to exist between Mercury and the Sun, explaining anomalies in Mercury’s orbit, and no Star Trek Vulcaniens were found to prove it . There are many others, and they are just as bizarre! Although none have ever been found, let's see how they would influence the solar system if they did exist!
