Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
Planet X is a theoretical planet thought to be beyond the orbits of Neptune and Uranus. Astronomers thought this planet could exist because of eccentricities in the orbits of the two ice giants. In the 1990s it was discovered the eccentricities were due to an over estimation of Neptune’s mass. It is widely agreed that Planet X does not exist in our solar system.
