In the frozen outskirts of the solar system, liquid flows on Pluto.

A new analysis of New Horizon images of the Sputnik Planitia, a section of Pluto’s massive, heart-shaped glacier, suggests ...

Planetary researchers analyzing images from NASA’s New Horizons spacecraft have found evidence that liquid nitrogen may still ...

Pluto may be far colder than any place on Earth, but scientists have discovered evidence that something surprising may still ...

Ask almost anyone why Pluto stopped being a planet and you will hear the same confident answer: it was too small. That answer ...