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

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

Independent previous research has also proposed a similar Planet Y to explain the warp or other features in the TNO ...

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

A recent study hints at a previously unknown Earth-sized planet, dubbed Planet Y, potentially influencing gravitational distortions in the outer solar system.

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

It’s “the most planet-y of the planets in the whole solar system,” said Brown, who is famous for helping demote Pluto to a dwarf planet. Related: Exoplanet hunters made key finds in 2015 ...

Searching for Planet X, Y and Z Space.com: Astronomers haven't yet found the fabled Planet X, but they are increasingly confident that such a 10th planet exists — in fact, several of them.

They’ve nicknamed the new object Planet Nine. Planet Nine’s mass is believed to be about 10 times that of Earth, and it’s distance, 20 times farther away from the sun than Pluto.

When that day comes, a vehicle you could use for day-to-day operations is the BU-99-Y. This exo-planet explorer is the work of Marnix Rekkers, a concept artist from Den Bosch, Netherlands.