Beyond Pluto: The hunt for our solar system’s new ninth planet
"It’s more likely than unlikely to exist"
Vast ocean under Pluto’s surface raises fresh hopes of extraterrestrials, study suggests
The ocean is thought to have existed for around four and a half billion years - older even than the seas on Earth
Pluto still deserves to be a planet, NASA chief says
Jim Bridenstine sticks by the dwarf planet