A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

Once inhabitants of this planet reached another planet, it terraformed the world in order to suit its needs — very similar to what humans are already considering. The team then analyzed the ...

For about a decade, he and other researchers have been trying to prove that the so-called "Planet 9" exists. So far, the only evidence has come from some oddities in the orbits of small Pluto-like ...