Astronomers may have demoted Pluto from full-fledged planet to dwarf status, but evidence suggests the solar system may still ...

The solar system lost its ninth planet back when Pluto was demoted to a dwarf planet, but research might indicate that there ...

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

In this quiz, you’ll test your knowledge of Neptune's features, moons, and the science that keeps astronomers fascinated.

Neptune is the farthest planet from the sun in our solar system and home to blistering winds and diamond rain.

A study suggests the ice giants Uranus and Neptune aren't quite as watery as previously thought. They may also contain huge amounts of frozen methane, potentially solving the puzzle of how they ...

The planet’s bluish disk is even smaller, thanks to its greater distance, and appears 2″ wide. Observing the solar system’s most distant planets is challenging but a worthy endeavor to ...

Though planetary alignments aren't uncommon, the amount of planets aligning on June 3 is unusual. Here's what to know about the "planet parade." ...