It took over nine years for New Horizons to reach Pluto after blasting off atop an Atlas 5 rocket on Jan. 19, 2006. After ...

Russian nuclear weapons testing has brought up renewed knowledge of the Pluto Project, a cancelled nuclear power test conducted by the Air Force.

A decade after Pluto was demoted, the first fly-by team has a radical proposal to restore its former status, resurrecting the biggest battle in space.

Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.

New research showcasing the dramatic topography of Pluto and its moon Charon should help scientists better guess what forces have shaped them.

It was once the ninth planet, but today the best-known dwarf planet in the galaxy is proving it's a giant when it comes to surprising discoveries.

It’s been 18 years since Pluto’s celestial status was called into question—yet the matter seems far from settled. We asked experts from both sides to make their case.

In 2006 the former ninth planet in the solar system, Pluto, got demoted to a mere Kuiper Belt object. The man who was in large part responsible for that demotion, Caltech planetary scientist Mike ...

Alan Stern, principal investigator of NASA's New Horizons mission, on his only prediction he made about the Pluto mission and what it would discover.

It was one of the most ambitious missions for NASA since the turn of the century, with photos reshaping what scientists know ...