Planet 9, still invisible in every telescope pointed its way, survives as a hypothesis because the orbital math keeps pointing back to an unseen mass. I see a pattern that has become harder to dismiss ...

For years, astronomers have suspected there’s a massive unseen world hiding far beyond Neptune — Planet 9. This video breaks ...

Astronomers believe there is a Planet Nine in the outer solar system beyond Neptune. A team led by Amos Chen from the National Tsing Hua University, is searching for Planet Nine’s heat signature. When ...

There may be a warp in the Kuiper Belt, possibly caused by “Planet Y” — a Mercury-to-Earth-sized world that orbits the sun way beyond the orbit of Neptune. Is there a mysterious “Planet Y” orbiting ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. The orbit of the newly detected dwarf planet ‘Ammonite’ (2023 KQ14, shown in red) compared to the ...

"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today." When you purchase through links on our site, we may earn an affiliate ...