When NASA's New Horizons spacecraft sped by Pluto in 2015, it revealed an incredible world of ice and haze carved by various geological processes — hinting that an ocean may have played a role in the ...

When the International Astronomical Union announced in 2006 that Pluto was being demoted from its status as the Sun’s ninth planet, many astronomers and non-experts alike were shocked. Pluto remains ...

CAPE CANAVERAL, Fla. -- NASA's New Horizons spacecraft got humanity's first up-close look at Pluto on Tuesday, sending word of its triumph across 3 billion miles to scientists waiting breathlessly ...

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 ...

This view of Pluto is dominated by Pluto’s “heart,” a region of icy plains. Members of the New Horizons team gather around a laptop as they review newly processed images being sent from the New ...

Pluto’s thin, blue haze glows in this image from NASA’s New Horizons spacecraft. Though the dwarf planet is just a faint speck through a telescope, opposition this month offers skywatchers their best ...

CAPE CANAVERAL, Fla. -- An unmanned NASA spacecraft hurtled toward Pluto on Thursday on a 3-billion-mile journey to the solar system's last unexplored planet -- a voyage so long that some of the ...

It has taken nearly a decade and 3 billion miles to get there, but scientists are about to get their first look at Pluto. The New Horizons spacecraft is closing fast on the tiny world once thought to ...