Many of you, like myself, were probably taught in grade school that Pluto was the ninth planet in our solar system, and, until 2006, this was accepted as fact. I’ll return to Pluto’s discovery, and ...

Known as Planet Nine or Planet X, it is a hypothetical planet that has ... a wealthy American businessman and astronomer, kicked off the search for it in 1906. For more than 70 years, Pluto ...