Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

"For the first time in over 150 years, there is solid evidence that the solar system's planetary census is incomplete." No observational evidence for Planet Nine has been found, although this is ...

Researchers have found a candidate for the hypothetical Planet Nine, which could be an undiscovered giant planet way out in our solar system. However, as with all ninth planet research, the new ...