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

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 ...

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

Think we already know all the planets in our solar system? Surprise surprise! 🌌 A mysterious new object with an extreme, ...

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

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

Planet Nine's composition is probably "most like Neptune," due to its distance from the sun, Brown said. "That would put its diameter at something like two times the width of Earth," he added.

If their calculations serve them correctly, Planet Nine would have a mass that is about 1.5 to 3 times that of Earth, at 500 times the distance between our home and the sun.

Nicknamed "Planet Nine," the real-life Planet X appears to have the mass of 10 Earths and is 20 times farther from the sun than Neptune. Skip to main content. Open menu Close menu.

Planet Nine, also known as Planet X, is a theoretical planet that is rumored to exist in the outer solar system.The Planet Nine hypothesis was first proposed in 2016 by Caltech astronomers Michael ...

In October 2017, NASA released a statement saying that Planet Nine may be 20 times further from the Sun than Neptune is, going so far as to say "it is now harder to imagine our solar system ...

Planet Nine's composition is probably "most like Neptune," due to its distance from the sun, Brown said. "That would put its diameter at something like two times the width of Earth," he added.