The Solar System does not have a clear border. The influence of the Sun in certain domains is small enough for the Voyager ...

Planet Nine was previously suggested as a possible explanation for distant orbital clustering. It was thought to be ten times Earth’s mass, orbiting far beyond Neptune.

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

Neptunes, exoplanets whose sizes are between Earth and Neptune, and which are between the known for their water-rich ...

A mysterious new world may be hiding in the outer reaches of our solar system. According to arecent study published on arXiv ...

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

A study suggests an Earth-sized planet, dubbed Planet Y, may exist beyond Neptune, affecting the orbits of icy objects in the ...

Recent research suggests a warp in the orbital plane of Trans-Neptunian Objects (TNOs) between 80 and 400 AU, hinting at the ...

For astrobiologists, the search for life beyond our solar system could be likened to where one would look in a vast ...

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

You might be thinking about a giant trilobite found on Pluto, or maybe a dinosaur skeleton on the planet. However, when astronomers use the word "fossil" for ...