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

In Roman mythology, Pluto is the god and ruler of the dead. For a return mission to the dwarf planet, Howett and her ...

With a diameter of 1,440 miles, Pluto is farthest from the sun. While major planets make roughly circular orbits, Pluto ...

For nearly a decade, the New Horizons Space probe has been flying toward Pluto in hopes of capturing the first real photos of it.

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

NASA's New Horizons probe flew closer to Pluto than any Earth-craft ever has Tuesday, sending back amazing photos of the dwarf planet.

After soaring by Pluto in 2015, the spacecraft pressed deeper into a region of the solar system known as the Kuiper Belt. This expanse of space is home to icy objects like Arrokoth, a snowman-shaped ...

New Horizons sends back best photos yet as probe closes in on Pluto. New color images from NASA’s New Horizons spacecraft show two very different faces of the mysterious dwarf planet, one with a ...

Pluto may become a planet again! "A dwarf hamster is still a small hamster," says Harvard-Smithsonian Friday, October 3, 2014 ...

NASA's New Horizons spacecraft has beamed back the first color image of Pluto and its largest moon, Charon.