Far beyond Neptune, strange patterns in the Kuiper Belt suggest something massive may be hiding in the darkness. This video ...

The hunt for Planet Nine continues as new discoveries make the Solar System’s biggest mystery even harder to solve. Is there ...

Most of us learned that the Solar System has eight planets. For many years, Pluto made it nine before being reclassified as a dwarf planet. But beyond Neptune, far past the Kuiper Belt, scientists ...

Our solar system has two ice giants, Uranus and Neptune, but there may have been a third. According to a new study published in the journal Icarus, this extra world might have triggered a violent ...

Astronomers have spent years searching for a possible hidden giant planet far beyond Neptune. Unusual orbits among distant ...