As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

TeamLab Planets, a huge immersive art museum, has become one of the most popular attractions in Tokyo, Japan. It's worth a ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge ...

Less than 1% of this dwarf planet candidate's orbit is close enough to detect, which means astronomers are lucky to have ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

Have we just all grown up with 9 planets and the thought ... We get this nice, easy to memorize symmetry of eight or nine planets and leave it at that. Should it be taught as more of an evolving ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

Scientists hunting for the hypothetical Planet Nine have discovered a potential new dwarf planet, 2017 OF201, in the outer ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Some astronomers say the strange, clustered orbits of icy rocks beyond Neptune indicate that something big is out there, ...