a moon of Neptune's, than any of the planets in the outer solar system. Nevertheless, because it orbited the Sun like a planet, it was classified as a planet and named Pluto, after the god of ...

Out past Neptune are countless small icy and rocky bodies called Trans-Neptunian Objects (TNOs), and many of these have moons ...

Unlike how scientists believe Earth's moon formed billions ... the primary materials of Pluto and other stuff in the Kuiper Belt, a disk beyond Neptune of comets and tiny ice worlds.

in diameter -- about one-fourth the size of the planet Pluto. The object is classified as a minor planet, like thousands of other asteroids and comets in our solar system. It is second in size ...

Pluto was once called the ninth planet, but in 2006, scientists changed its status to a dwarf planet. A planet must clear its orbit of other objects, but Pluto shares its space with many small icy ...

The James Webb Space Telescope identified the lights in the distant planet’s atmosphere, which could not be seen by earlier ...

The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.