Unlike Earth, where the Moon orbits the planet, Pluto and Charon orbit each other, forming a binary system that is more similar to the Earth-moon system than any other moon in the solar system.

Arrokoth, located a billion miles beyond Pluto, is one of the coldest places where we've directly measured the temperature.

The large mound structures that dominate one of the lobes of the Kuiper belt object Arrokoth are similar enough to suggest a common origin, according to a new study led by Southwest Research ...

Experts in France and the US say a snowman-shaped space rock called Arrokoth, in the outskirts of our solar system beyond ...