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 ...

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

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.

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

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.