In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and ...

The International Astronomical Union’s Minor Planet Center, which catalogs new moons and other small bodies in the solar ...

Peter Bjorn and John, Sturgill Simpson, Bear McCreary, and Worlds Greatest Dad perform, and Gabe Henry brings Enough Is Enuf ...

Now, a newly identified object spotted in two infrared sky surveys has renewed the question of whether the elusive and hypothetical Planet 9 actually exists. According to a new pre-print study ...

Planet Nine, also known as Planet X, is a hypothetical celestial object that would distantly orbit our Sun – but there is significant debate in the scientific community about whether it exists.

The argument for the planet has to do with the Kuiper Belt: a region of icy debris far beyond Neptune’s orbit. The hypothetical planet would explain some strange orbits of the objects there.

However, skepticism doesn’t mean there’s nothing there. The argument for the planet has to do with the Kuiper Belt: a region of icy debris far beyond Neptune’s orbit. The hypothetical planet would ...

(Pluto is considered a Kuiper Belt object.) This hypothetical Planet 9 has never been directly observed and remains theoretical, but in new research uploaded to the preprint site arXiV, scientists ...

The newcomer replacing Pluto presently goes by “Planet Nine.” If and when it finally shows up, it will get the honor of a real name, but so far, the evidence for this hypothetical planet is ...