An artist's concept of the dwarf planet Eris and its moon Dysnomia is seen in this undated illustration released by NASA. The sun is the small star in the distance. NASA/JPL-Caltech/Handout via ...

A moon helps to uncover strange solar system body Eris By watching Eris' moons orbit around it, researchers have gleaned information about the dwarf planet's interior and how it differs from Pluto.

The first important clue is that Eris and its moon, Dysnomia, always face the same way toward each other. “That happens because the big planet gets spun down by the tides that the little moon raises ...

They needed some space. New research suggests Pluto may have had a “kiss” with its largest moon billions of years ago in a harmless collision. The report, published in “Nature Geoscience ...

Pluto and Charon’s meet-cute may have started with a kiss. New computer simulations of the dwarf planet and its largest moon suggest that the pair got together in a “kiss-and-capture ...

What processes during the formation of Pluto's largest moon, Charon, potentially led to it having cryovolcanism, and even an ...

Pluto and its largest moon Charon could have come together via a 10-hour “kiss-and-capture” encounter after a grazing collision ...

In fact, Eris in particular, appeared to be larger than Pluto – giving rise to its informal designation as the solar system’s ‘tenth planet.’ ...

Our Solar System’s moons and planets have water—in the form of ice, vapor, and even oceans. Scientists are finding more evidence of water outside of Earth.

While Eris is roughly the same size as Pluto and Makemake is about the same size as Pluto’s moon, Charon, both dwarf planets are far beyond even Pluto’s icy corner of the Solar System.

Dwarf planet Eris’ rotation is constrained by its large moon Dysnomia, named after the Greek goddess of lawlessness.

New research suggests Pluto may have had a "kiss" with its largest moon billions of years ago in an uncanny, harmless collision.