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

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.

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Sedna will reach its closest approach to the Sun in 2076, providing a remarkable space-faring opportunity that won’t come ...

A possible dwarf planet, like Pluto, has been observed in our solar system, according to a preprint published in arXiv. The area of space where this planet was found was previously thought empty.

Scientists have proposed two experimental spacecraft that could reach one of the farthest known objects in the solar system ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

The James Webb Space Telescope (JWST) has discovered that a hazy sky over frozen Pluto is helping to cool the dwarf planet's ...

Comet or asteroid heading for the Sun is only the third time an interstellar object has been spotted inside our group of ...

The James Webb telescope has made another stunning discovery -- this time of a massive planet that could potentially sustain ...