On Aug. 24, 2006, the International Astronomical Union (IAU) decided that Pluto wasn't a planet anymore. Instead, Pluto is ...

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 ...

Soon, we should see stunning images from three billion miles away. Ever since Clyde Tombaugh discovered Pluto in 1930, it's been a spec of light in space. Little has been known or taught about Pluto.

Pluto’s heart-shaped feature, known as Tombaugh Regio, has captivated scientists and the public alike since its discovery.

Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a ...

The space probe began making discoveries even before today's flyby. — -- Three billion miles and nearly ten years of travel led up to the moment NASA's New Horizons probe zoomed past Pluto ...

In 2005, this image from NASA's Hubble Space Telescope was used to identify two new moons orbiting Pluto (Nix and Hydra), to the right of Charon.

New Horizons launched nine years ago to explore now dwarf-planet Pluto and its moons. After a journey stretching 3 billion miles, the space probe woke from hibernation in December to prepare for ...

New data from the James Webb telescope reveals that Pluto's strange atmospheric haze controls its climate, surprising scientists.

New Horizons kept busy during the approach. It recently measured Pluto and its largest moon, Charon, so NASA could release an image to demonstrate how big they are compared to our planet. Pluto's ...

“The SDC is the only dust instrument that has ever measured the outer reaches of our solar system.” After soaring by Pluto in 2015, the spacecraft pressed deeper into a region of the solar system ...

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 ...