Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a dwarf planet. Recent observations suggest that its atmosphere is expanding, ...

A new analysis has found evidence of liquid on Pluto's surface, NASA says. A new analysis of imagery collected during NASA's New Horizons spacecraft's 2015 encounter with Pluto provides evidence that ...

Add Yahoo as a preferred source to see more of our stories on Google. Dark markings on Pluto's largest glacier may be evidence that liquid nitrogen recently rose and flowed across its surface. (CREDIT ...

Scientists have detected evidence of landslides on Pluto for the first time. A paper published in the journal Icarus reports that images taken by the New Horizons spacecraft during a flyby revealed ...

On the 20th anniversary of Pluto’s infamous demotion, Mike “Pluto Killer” Brown explains why any reversal of that decision ...

Pluto's surface stays at about −393°F (−236°C), cold enough that nitrogen there isn't a gas at all but a glacier miles deep. Nothing about a world that ...

For decades, Pluto remained one of the most mysterious objects in our solar system, until July 14, 2015, when NASA's New Horizons spacecraft became the first mission to visit it up close, capturing ...

For the first time since its discovery in 1920, Pluto is entering the outer solar system—a journey that’s slowly thinning out its atmosphere.