A newly discovered dwarf planet called 'Ammonite' (2023 KQ14) has been spotted in the outer solar system, and it could be ...

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

We still don't know for sure if there's a ninth planet in our solar system, but a new discovery could help to prove that ...

Astronomers have discovered "Ammonite," a mysterious object on the solar system’s edge whose unusual orbit challenges current ...

Astronomers have discovered a new member of a rare and mysterious class of solar system objects known as sednoids - a subset of extreme trans-Neptunian objects (ETNOs) with exceptionally distant, ...

"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.

Astronomers have discovered a "fossil" world lying in the outskirts of the solar system, according to new research.

Despite the powerful telescopes that modern astronomers have to work with, the distant reaches of the Solar System are still ...

The discovery was made by astronomers using the Subaru Telescope, which is situated atop a dormant volcano in Hawaii.

A telescope has discovered a new world on the edge of the Milky Way – potentially confirming the ‘Planet X’ theory. Beyond ...