Twenty years after Pluto lost its planetary status, the debate continues as scientists still disagree over what defines a ...

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

We now know Pluto much better, thanks to NASA's New Horizons mission, leaving CNET's Eric Mack to wonder how the former planet compares to our home rock. With a clearer picture of Pluto streaming home ...

Pluto has had a tough few years since losing its planet status. In the years since its demotion, NASA scientists found the trans-Neptunian object to be a colder, hazier hellscape than once believed, ...

In 2015, the New Horizons space probe discovered spectacular snowcapped mountains on Pluto, which are strikingly similar to mountains on Earth. Such a landscape had never before been observed ...

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.

The evolution of Kuiper Belt objects, Pluto and its lone moon Charon may have something in common with Earth and our single Moon: a giant impact in the distant past. Boulder, Colo. -- January 27, 2005 ...

Ever since New Horizons completed its closest flyby of Pluto on July 14, NASA has been gracing us plebeians with the most stunning Pluto porn that a $700 million mission can buy. From psychedelic ...

A researcher has used advanced models that indicate that the formation of Pluto and Charon may parallel that of the Earth-Moon system. Both systems include a moon that is a large fraction of the size ...

Pluto’s snow-capped mountains look like they belong on Earth, but researchers have discovered that the snowy tops of these features are actually made of methane frost. These mountains gather snow in a ...

Left: Alan Stern holds a 2005 Hubble image of the Pluto system on January 19, 2006, two hours after the successful launch of the New Horizons probe. Right: A triumphant Stern holds a full-frame image ...