A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in our solar system.

In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet. It's called 2017 OF 201, a rock that appears to be some 700 ...

A rare observation opportunity revealed the presence of a thin atmosphere around a small object beyond Pluto.

If confirmed, the rock would become just the second world past Neptune in our solar system to host an atmosphere.

The head of NASA says maybe Pluto is a planet after all. He is wrong because Pluto is part of the rest of the solar system ...

This story is part of Short Wave's series Space Camp about all the weird, wonderful things happening in the universe. Check out the rest of the series. If you were born in the last century you might ...

Labroots recently explored Saturn’s sponge-like moon, Hyperion, with its deep craters and non-spherical shape. This moon is an example of how the Universe and the laws of astrophysics work in both ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists —... Pluto isn’t a planet — but it gives us clues for how the ...