Scientists have proposed two experimental spacecraft that could reach one of the farthest known objects in the solar system in as little as seven years. The team of researchers, from Italy, ...

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.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Does our solar system have a new dwarf planet? ... Pluto’s orbital extremes are 29½ times the Earth-Sun distance at its closest and 49⅓ times that distance at its farthest.

But at its furthest point during its orbit, ... Cheng said the discovery of 2017 OF201 has implications for hypotheses involving the potential existence of a ninth planet in our solar system, ...