Find Hot Moons in Your Area: The Search for Planet Nine
How Pluto put Lowell Observatory on the map
Help astronomers find our Solar System's 'ninth planet'
Beyond Pluto: the hunt for our solar system's new ninth planet, Planets
Celestial target of small worlds beyond Pluto, Astronomy
The Hunt for 'Planet Nine' Unearths 12 New Moons Around Jupiter - WSJ
The Hunt for 'Planet Nine' Unearths 12 New Moons Around Jupiter - WSJ
Beyond Pluto: the hunt for our solar system's new ninth planet, Planets
Unexplainable podcast: 7 solar system mysteries scientists haven't solved yet - Vox
A distant planet may lurk far beyond Neptune