As astronomers continue discovering unusual worlds beyond our solar system, many say the question that divided scientists in ...

On the 20th anniversary of Pluto’s infamous demotion, Mike “Pluto Killer” Brown explains why any reversal of that decision would be driven more by nostalgia than science ...

Scientists continue to disagree over how worlds in the solar system should be classified. The argument turns on whether ...

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.

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 ...

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 ...

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, ...

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 ...

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 ...

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 ...