The strange blend of surface chemistry on Nix and Hydra raises big question about the evolution of the Pluto system.

Pluto has had a tough couple of decades. Formerly the ninth planet in our solar system, Pluto was demoted in 2006 to a “dwarf ...

New exhibit to replace Greenbelt Planet Walk with a new trail through Julia Davis Park — but this time, with one less member ...

This 'Kuiper Belt' of minor planets beyond Neptune revolutionised our understanding of the solar system's formation and finally explained the origin of the enigmatic outer planet Pluto. This is the ...

NASA’s New Horizons mission revolutionized our view of Pluto, revealing a vibrant, geologically active world full of ...

A new paper discusses the possible existence of an unseen planet in the outer solar system, the so-called "Planet X" or ...

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars.

Named for the maiden-snatching, shadow-dwelling god of the underworld, the small but mighty planet Pluto is associated with destruction, subversion, depth, intensity, primal urges, the taboo ...

In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

We take a look at the current best predictions for what the solar system will look like throughout the rest of the Sun's life ...

The solar system's planets are releasing albums reflecting their unique personalities. Mercury offers a fast and funky ...