When NASA’s New Horizons spacecraft flew past Pluto in 2015, it revealed a world far more active and complex than scientists expected. Researchers later found evidence that a liquid ocean may exist ...

Pluto will complete its first orbit since 1930 in 2178, a historic 248-year space journey that spans generations of humans.

Pluto, once thought to be a frozen and lifeless world drifting on the edge of our solar system, may be harboring one of its most intriguing secrets: a vast underground ocean. A landmark study ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. A close up of Pluto's ...

Why does Pluto's orbit take so long? Pluto's orbit is not like those of the eight major planets, which are relatively circular. Instead, it is highly elliptical and tilted. At tim ...

FLAGSTAFF — As NASA’s New Horizons spacecraft zooms ever closer to Pluto, it is sending back images that make even seasoned scientists’ eyes go wide with excitement. “Like a kid in the candy shop,” ...