Pluto has an ocean hidden beneath its surface
Scientists claim the subsurface ocean contains as much water as all of Earth’s seas
The search is on for the ninth planet
That’s Maths: If such a planet is found, the solar system must be much larger than we had imagined
World gets close look at photographs of dwarf planet Pluto
Nasa releases close-up photographs taken by its New Horizons space probe
The strange dynamic of Pluto’s chaotic family
That’s Maths: The New Horizons probe will pass the dwarf planet this month and is likely to find more tiny moons of Pluto
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