A tiny object far beyond Pluto, newly discovered by the Subaru Telescope, could reshape our understanding of the early Solar ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today ...

Planet Nine should appear stationary over the course of a single day but show detectable movement over months.

Researchers use the Subaru Telescope in Hawaii to find a small object on the outer edge of the Solar System. Nicknamed ...

For years, scientists have been scanning the icy outskirts of our Solar System for an unknown massive planet. The disturbances observed in the orbits of Kuiper belt objects suggest the presence ...

Astronomers have hoped for the existence of Planet Nine for years. Things were looking promising, but this discovery might ...

Growing up, I was taught that there were nine planets in the solar system. That all changed in 2006, when the International Astronomical Union voted to demote Pluto’s status to that of dwarf planet.

If Planet 9 is on the smaller side, dark, and really far away, he explains, "it's going to be on the edge of Vera Rubin detection, and Vera Rubin may not find it." ...

Planet Nine is a hypothetical planet, first theorised by astronomers from California Institute of Technology (Caltech) back in 2016. Said to have a mass about five to 10 times that of Earth, this ...

But even if it doesn't spot Planet 9 directly, the Rubin Observatory might find some more minor planets, ones whose orbits might be affected by Planet 9. And that could provide additional evidence ...