Operation Nibiru

Since Pluto was kicked out of the nine planets in the solar system, humans have never discovered another planet so far. Some people will definitely wonder why humans can discover planets a few light-years away, but cannot discover some planets in the solar system. This is because the exoplanet will block the star's light source for a certain period of time during its revolution. Based on the degree of reduction in the star's brightness, it can be inferred what kind of planet is around the star. However, planets at the edge of the solar system basically do not intercept the light sources of other stars, so they are difficult to observe. Maybe the observations from thousands of years ago were true. Maybe there was a rogue planet passing through the solar system at that time and was observed by our ancestors. It's just that the planet may have left the solar system in the past few thousand years, or it may be too far away from us to be observed. As long as humankind continues to develop steadily, sooner or later these planets will be unveiled, so cherish the current earth first, and then talk about the more distant journey.