The term "hidden planet" in our solar system commonly refers to the hypothetical "Planet X".
Based on mathematical evidence, Caltech researchers suggest the possible existence of this planet. Here's what we know about this proposed Planet X:
- It is hypothesized to be Neptune-sized.
- It orbits our Sun in a highly elongated orbit.
- Its orbit is far beyond Pluto.
Therefore, while not yet directly observed, Planet X is the leading candidate for a "hidden planet" in our solar system. It remains a subject of ongoing research and investigation.
