A 'Captured' Alien Planet May Be Hiding at the Edge of Our Solar

Our Sun Could Be Harbouring a Runaway Alien Planet At the Edge of the Solar System

The nine most mysterious objects in the Universe - BBC Science Focus Magazine

Astronomers puzzled by 'planet that shouldn't exist

How You Will Die On Every Planet

Mysterious 'zombie planet' Halla seems to have…

European space mission takes search for alien life to Jupiter's icy moons

Is there really a planet in our solar system larger than Earth hiding beyond Pluto, or is the media just trolling me? - Quora

Amateur astronomers spot new impact on Jupiter

Opinion Wait, Are There Actually Aliens? - The New York Times

Elusive Planet Nine could be an alternative form of gravity masquerading as a planet, study claims